All twenty-three episodes and the unaired pilot of the BBC television crime drama, created by Anthony Horowitz and starring David Suchet, Diana Rigg, Steve McFadden, Denise Van Outen and Keeley Hawes, among others. In a series of self-contained short films exploring the psychology and motive of an array of different killers, a respected headmaster gets embroiled in a rent boy's accidental murder, an off-duty police officer turns vigilante and ends up murdering a convicted paedophile, a lonely call-centre worker becomes obsessed with her boss and decides to murder the co-worker she suspects of having an affair with him, and a mother decides to take a brutal revenge on the man responsible for bullying her son and forcing him to suicide over 25 years ago. Episodes from series one are: 'Teacher'; 'Flame'; 'Motive'; 'Mercy'; 'Vigilante'; 'Neighbours' and 'Sleeper'. Episodes from series two are: 'Passion'; 'Disposal'; 'Rage'; 'Swan Song'; 'Flashback'; 'Victim'; 'Memories' and 'Regret'. Episodes from series three are: 'Echoes'; 'Favours'; 'Stalkers'; 'Suicide'; 'Contract'; 'Landlord'; 'Justice' and 'Cornershop'.