Based on the novel by Christos Tsiolkas, this drama explores how a single event can cause significant repercussions for a group of family and friends. The event? A slap. Specifically, a man, Harry, slapping a 4-year-old boy, who is not his son, at the 40th birthday party of Harry's cousin, Hector. The incident infuriates the boys' parents, resulting in a trial where the story is told from the points of view of eight people. "The Slap," as the event comes to be known, greatly affects each character's life and, in turn, results in each character being "slapped" and forced to face truths about themselves.