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

Adventurer James Keziah Delaney returns to London from Africa in 1814 along with fourteen stolen diamonds to seek vengeance after the death of his father.

Adventurer James Keziah Delaney returns to London from Africa in 1814 along with fourteen stolen diamonds to seek vengeance after the death of his father.