The already dysfunctional lives of Helen, Jake and Natalie are thrown into disarray when their recently widowed mother Vivien (Francesca Annis) declares she’s in love with a new man, retired surgeon Mark (Stephen Rea). Their suspicion of the newcomer triggers events in the siblings’ own complex love lives, which begin to spiral out of control. Next door neighbor Mary (Imelda Staunton) has known the family for years and tries to support them all with wise counsel, but seems powerless to stop the events from escalating. Can this once-close family overcome years of secrets and repressed sibling rivalry to pull together, or will old rifts and new conflicts push them apart? And even push them to the point of violence? Right from the start, we know that someone’s life is hanging in the balance – but not whose life, nor how it happened. As the mystery unravels, this dark yet deliciously witty thriller explores family dynamics, modern relationships, love, loyalty and betrayal, and keeps us guessing right up until the very last moment.