The Nautical Chart — Arturo Perez-Reverte

A fearless Spanish crew embarks on a search for a lost ship, swallowed by the Indian Ocean centuries ago, in a novel by “a master of the literary thriller” (Booklist, starred review).
 
Manuel Coy is a suspended sailor with time on his hands, a mariner without a ship. While attending a maritime auction in Barcelona, he meets Tánger Soto, a captivating beauty who works for the Naval Museum in Madrid. A woman obsessed with the Dei Gloria, a famed Jesuit ship sunk by pirates in the seventeenth century, she now hopes to find it and unearth its mysteries, rumored to be buried the bottom of the sea off the southern coast of Spain.
 
Quickly drawn into the search, Coy accompanies Tánger Soto, and a wise old man of the sea whose sailboat will carry the crew into the middle of nowhere in search of a fortune. But more than treasure is rising to the surface -- secrets are, too. And from these depths will also come danger, and an adventure no one is prepared for.
 
From the acclaimed author of The Queen of the South, The Nautical Chart is “a swashbuckling tale of mystery” (The Washington Post Book World).