Predator of the SeasThe dramatic biography of a slaveship turned freedom fighterwhich brings new insights into Britain's involvement in the end of the trade in enslaved people In 1827 the Royal Navy purchased a Baltimore clipper and renamed her the Black Joke. Assigned to the Preventative Squadron, she patrolled the west coast of Africa and freed 3,692 captives from enslavement. Beloved by seafarers and celebrated by the public, the Black Joke would become the most