Scuba diving off the Tanzanian coast, husband-and-wife treasure-hunting team, Sam and Remi Fargo discover a huge ship's bell, covered in cryptic carvings. But as they struggle to first recover the bell and then decode its clues, they find they are not alone in wanting to discover its secrets.

Scuba diving off the Tanzanian coast, husband-and-wife treasure-hunting team, Sam and Remi Fargo discover a huge ship's bell, covered in cryptic carvings. But as they struggle to first recover the bell and then decode its clues, they find they are not alone in wanting to discover its secrets.