The mystery is what happened to Alice's marriage. Alice, suffering from a concussion and subsequent amnesia is the one trying to figure out who she is and how it went wrong. Another marvelous book full of kids and after school activities and how destructive it is for a marriage when gender roles make one person the breadwinner and one person the parent. And yes, it is also very white and heteronormative and upper middle class suburban, but again, Moriarty takes seriously the business of having and rearing children, and that is important. Plus now I basically see Reese Witherspoon playing the lead role in every one of the books and I like Reese Witherspoon, so that's okay.
I only have one Moriarty book left to read, and then I am going to be very sad for a while.