One victim, found dead on a London street. Four detectives, in four different time periods, must solve the mystery to protect Britain's future.

A lone scientist in the Arctic races to contact a crew of astronauts returning home to a mysterious global catastrophe.

One victim, found dead on a London street. Four detectives, in four different time periods, must solve the mystery to protect Britain's future.

A lone scientist in the Arctic races to contact a crew of astronauts returning home to a mysterious global catastrophe.