The Rosie Project ended with Don Tillman and Rosie Jarman married and settled in New York -- The Rosie Effect picks up there, and complicates it fast with an unplanned pregnancy that neither of them planned for or, in Don's case, entirely knows how to process. It's the direct sequel to a book already reviewed elsewhere on this site, and this review focuses specifically on how it compares -- including the real, sourced reader consensus that it doesn't quite match the original's charm.
What the Book Actually Is
Don, now teaching genetics at Columbia and adjusting to married life, learns Rosie is pregnant while she's deep in her own doctoral program. The novel follows Don's characteristically literal, methodical approach to an experience -- pregnancy and impending fatherhood -- that resists literal, methodical planning, with predictable friction in the marriage that made the first book work.
About Graeme Simsion and Why He Wrote This
Simsion was born in New Zealand and moved to Australia at twelve. Before fiction, he spent decades as an information-systems consultant and co-authored a pair of nonfiction books on database design, only turning to fiction at around fifty. The Rosie Project started as a screenplay, not a novel -- it won the Australian Writers' Guild/Inscription Award for best romantic comedy before Simsion rewrote it as prose in about four weeks, then spent a few more cleaning it up and entering it for the Victorian Premier's Literary Award for an unpublished manuscript, which it won in 2012. He's said Don Tillman's voice came from thirty years spent working alongside people in IT and academia, several of whom struck him as sharing Don's literal, rule-based way of moving through the world, though none had an actual diagnosis; he's been deliberate about never confirming in the text whether Don has Asperger's syndrome. Simsion is married to Anne Buist, a professor of women's mental health at the University of Melbourne who specializes in perinatal psychiatry -- a detail that sits close to this particular sequel's subject matter, since The Rosie Effect is built entirely around Don and Rosie's pregnancy.
How It Compares to The Rosie Project
Reader consensus is specific and consistent on this point: Don's character growth from the first book -- the whole emotional engine of The Rosie Project -- gets meaningfully walked back here, with reviewers noting he regresses rather than continuing to develop. The witty, off-kilter chemistry between Don and Rosie that carried the original is widely described as having 'lost its magic' in the sequel, replaced by more conventional marital friction.
Where Real Reviews Pushed Back
Beyond the character regression, some readers specifically pushed back on the book's focus, feeling it dwelt too heavily on how difficult the pregnancy adjustment was for Don specifically, at the expense of Rosie's own experience -- a fair critique for a book whose predecessor worked partly because it took Rosie's perspective seriously alongside Don's. That said, even critical reviewers generally still found it enjoyable, just 'not quite as good as the first book.'
Why Simsion Wrote a Sequel at All
Simsion wasn't initially set on returning to Don Tillman -- he's said he tested whether the character still had anything left to say by drafting a few sample chapters before committing to a full sequel. Two things pushed him forward: reader feedback questioning whether The Rosie Project's tidy, happy ending was realistic for a couple with as much friction built into their differences as Don and Rosie had, and his own conversations with expectant and new parents about how a first pregnancy actually reshapes a relationship. Rather than write a straightforward continuation of the romance, he built the sequel around a genuine stress test of the marriage -- which is also why reader reviews describing Don's growth as "regressing" land as at least partly intentional rather than a simple misstep: Simsion set out to show the relationship under real pressure, not to repeat the first book's arc.
Don Tillman and the Ambiguity of Asperger's Representation
Both novels lean on a specific, deliberate choice: the text never states outright that Don has Asperger's syndrome, even though his literal thinking, sensory sensitivities, rigid routines, and rule-based approach to relationships read as clearly autistic-coded traits. Simsion has said this was intentional, and the ambiguity is part of why the character has been embraced by some readers and advocates as a positive, humanizing depiction rather than a diagnosis-driven case study. The Rosie Effect keeps that same approach while raising the stakes -- Don's methodical coping mechanisms, which mostly read as charming in the first book, get tested by something that fundamentally resists his need for order and predictability: an unplanned pregnancy and the sheer unpredictability of a newborn. Reviewers who found this book's Don less charming than the first book's are, in effect, reacting to the same traits placed under more strain, not to a rewritten character.
Key Takeaways
- The Rosie Project began as a screenplay that won an Australian Writers' Guild award before Simsion rewrote it as a novel in about four weeks and won Australia's Victorian Premier's Literary Award for an unpublished manuscript in 2012
- Simsion has said Don Tillman's voice draws on real people he worked with over thirty years in IT and academia, though he deliberately never confirms in the text whether Don has Asperger's syndrome
- Simsion tested the sequel by drafting sample chapters first, and wrote it partly in response to readers questioning how realistic the first book's happy ending really was for this couple
- Simsion's wife, Anne Buist, is a professor of women's mental health specializing in perinatal psychiatry, a detail relevant to a sequel built entirely around pregnancy and new parenthood
- The reader complaint that Don "regresses" in this book reflects the same character traits under more strain, not a different character -- Simsion built the sequel as a stress test of the marriage rather than a repeat of the original's arc
Who This Book Is Actually For
Readers who already loved The Rosie Project and specifically want to know what happens to Don and Rosie next, with tempered expectations that the sequel doesn't match the original's freshness.
Who Should Read Something Else Instead
If you haven't read The Rosie Project, start there -- this sequel assumes you already care about these characters, and its diminished charm compared to the original will land harder without that context.
Pros and Cons
Pros:
- Continues a genuinely beloved couple's story for readers invested in Don and Rosie specifically
- Still has moments of Simsion's characteristic humor around Don's literal-minded worldview
- Solid 3.62 out of 5 rating across nearly 82,000 Goodreads ratings
- Explores a real, relatable challenge -- pregnancy and parenthood anxiety -- through Don's distinct narrative voice
- Quick, accessible read consistent with the tone of the first book
Cons:
- Reader consensus consistently notes Don's character development regresses compared to the first book
- The witty chemistry between Don and Rosie is widely described as diminished compared to the original
- Some readers found the focus skewed too heavily toward Don's adjustment at the expense of Rosie's own experience
Frequently Asked Questions
Do I need to read The Rosie Project first?
Yes, strongly recommended -- this is a direct sequel that assumes emotional investment in Don and Rosie's relationship from the first book.
What's the actual Goodreads rating?
3.62 out of 5 from roughly 81,800 ratings as of this writing, noticeably lower than most reader ratings for the first book.
Is it as good as The Rosie Project?
Reader consensus says no -- multiple sourced reviews describe Don's growth as regressing and the couple's chemistry as diminished compared to the original.
Is there a third book?
Yes -- The Rosie Result completes the trilogy, following the family as their son grows older.
Sources & Further Reading
- Goodreads -- The Rosie Effect (aggregate rating, reader reviews)
- KUT (NPR) -- "Author Graeme Simsion on Asperger's, 'The Rosie Project' and Its Sequel"
- The A.V. Club -- "Graeme Simsion revisits prickly Don Tillman in The Rosie Effect"
- PositiveLifes.com — free inspirational and life-changing PDF books
Final Verdict
The Rosie Effect is a real, if diminished, follow-up to a book many readers loved -- the sourced consensus is consistent that Don's growth regresses and the original chemistry doesn't fully carry over. It's still an enjoyable read for anyone invested in these characters, just worth going in with tempered expectations rather than hoping for a repeat of the original's charm.
Buy Day rating: 7.0/10