Poirot investigates when Mrs Asher of Andover is found murdered beside an ABC Rail Guide.
Old wounds are reopened when Lynley investigates the disturbing death of his godson, more than a decade after the boy's disappearance.
A normal day becomes a world of terror as every child in the world stops. A message is sent to the governments of Earth: 'We are coming'. A trap closes around Captain Jack.
Jericho and his team try to understand the circumstances surrounding the death of a thermonuclear scientist who's found strangled, with lipstick on his cheek and newspaper stuffed in his mouth.
Torchwood finally learns the truth about the events of 1965. Britain is in danger of becoming a rogue state, as the ambassador of the 456 reveals its true intent.