Se7en

In this hugely influential thriller, a veteran homicide detective (Morgan Freeman) and his young partner (Brad Pitt) pursue a serial killer who is selecting his victims according to the Seven Deadly Sins. Director David Fincher pioneers the recent style of rain-lashed gloom in a chiller with more twists than a corkscrew factory. One of those rare films where a Hollywood ending was notable by its absence. Don't watch it alone.