A woman tries to find her way home with her newborn while an environmental crisis submerges London in floodwaters.

Story takes place in the late 1990s, when the arrival of elderly invalid Patrick into Marion and Tom’s home, triggers the exploration of seismic events from 40 years previous: the passionate relationship between Tom and Patrick at a time when homosexuality was illegal.

Troubled war veteran turned Police Sergeant David Budd is assigned to protect controversial Home Secretary Julia Montague.