Joseph Williams will discuss his latest book The Sunken Gold: A Story of World War I Espionage and the Greatest Treasure Salvage in History at the Ridgefield Library on Thursday, Jan. 18, at 7 p.m.

The Sunken Gold is the story of how a British ship, HMS Laurentic, laden with 44 tons of allied gold bound for the United States, was sunk off the coast of Ireland by Germany and the epic struggle by divers from the British Navy to recover the treasure. The book also describes the underwater spy work conducted by the divers by breaking into sunken U-boats looking for codes, ciphers and other secret documents.

Williams is the deputy director of the Greenwich Public Library, and the author of Seventeen Fathoms Deep: The Saga of the Submarine S-4 Disaster. He lives in Ridgefield with his wife and two daughters.

For more information and to register, visit Ridgefieldlibrary.org or call 203-438-2282.