A pile of lime-encrusted shackles discovered on the seafloor in the remains of a ship called the Henrietta Marie, lands Michael Cottman, a Washington, D.C.-based journalist and avid scuba diver, in the middle of an amazing journey that stretches across three continents, from foundries and tombs in England, to slave ports on the shores of West Africa, to present-day Caribbean plantations. This is more than just the story of one ship - it's the untold story of millions of people taken as captives to the New World. Told from the author's perspective, this book introduces young readers to the wonders of diving, detective work, and discovery, while shedding light on the history of slavery.