** spoiler alert ** 
 This started out so funny, but fell flat for me shortly after. Don Tillman is still his practical and disciplined self (with a bit more self-awareness) from the first novel The Rosie Project. But Rosie's role in this book seemed to be watered down leaving her character with little to no charm. There are still glints of intentional fun to be had, if you can find it through all of the statistics and the increasing circle of friends Don has collected (none of which, strangely, seemed to have originated with Rosie). 
 While the build up to the book was all about Rosie having a baby, the birth and aftermath was relegated to a few pages at the end. I assume this is to allow the next book to devote its pages to their new child. A good read, but lacking the heart of the first book.