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

The fascinating cases of every day, seemingly average moms, wives and girlfriends accused of murder. Did they really do it? And if so, why?

When a killer wants you dead, there's one place to search: home sweet home. With the twist of a lock, your home should be your sanctuary. For some, it becomes a hunting ground - and no lock, security system or call to 911 will save them.