Not long after securing an acquittal for Garry Ashe in his aunt's murder, controversial defense barrister Venetia Aldridge is fatally stabbed. Suspicion falls on her colleagues, with whom she fought, and on her daughter's fiancé - none other than Ashe.

Marcus and Caroline Dupayne struggle to convince their brother, Neville, to renew the lease on their family's museum. When Neville's car is torched on the museum grounds and he perishes inside, all who work there are suspects-including his siblings.