So I just finished the book last night and my head's still spinning a bit. The central figure is definitely Jen, a lawyer and mother who witnesses her teenage son, Todd, commit a murder right outside their house. The whole story hinges on her perspective as she's thrown back in time day by day, trying to unravel what led to that moment.
Her husband, Kelly, is the other major character in the 'present' timeline, but the book spends a lot of time in the past exploring younger versions of them and the people they knew. The real puzzle is figuring out who the victim, a man named Joseph Lally, actually was and how he connects to Jen's family. The character work on a younger, more carefree version of Jen before she became a worried mom was what really got me.