Goodnight Nobody by Jennifer Weiner

Kate Klein is a miserable surburban mother of 3 young children who gets caught up in solving the murder of Kitty Cavanaugh, an idyllic suburbanite mother with as it turns out had a secret life. Kate, who has no life at all and can barely manage to get out the door with her kids, bumbles her way through the book and very complicated plots and subplots. As with any Jennifer Weiner book, this one is funny and entertaining.