Summary of Liane Moriarty's Truly Madly Guilty, a novel by Liane Moriarty, flashes back and forth in time between the afternoon of a traumatic barbecue and its aftermath. The story, which unfolds in Sydney, Australia, and its suburbs, describes the lives of the attendees two months after the barbecue where a little girl nearly drowned. Under a backdrop of incessant rain, over a period of months, three families cope with fallout from their fateful gathering with varying degrees of success.

Erika and Oliver, who are husband and wife, want a child very badly. More accurately, Oliver wants a child very badly and Erika wants Oliver to be happy. After they endure two years of unsuccessful in vitro fertilization treatments, their doctor suggests that they look for an egg donor. The obvious choice is Erika’s best friend, Clementine Hart. Erika and Oliver invite Clementine and her husband, Sam, and their two little girls, Holly and…