Moonfleet - Season 1 Episode 2

Now outlaws Elzevir and John deduce that the diamond is hidden in a well at Carisbrook castle prison and bribe the turn-key to let them in, posing as workmen. They find the diamond but Elzevir is shocked by John's ruthlessness when he kills the turn-key, who has threatened to expose them. After attempting to sell the jewel they are captured and sentenced to be sent to the East Indies as slaves. Their ship runs into a violent storm off the coast of Moonfleet and they swim ashore - but the curse of Blackbeard's diamond may still prevent them from resuming normal lives.