Book excerpt: Julian "Tusker" Tusk, an American archaeologist, is excavating a shipwreck half a world from home when a research boat catches fire and sinks, killing an old friend. The tragedy sets in motion a dangerous quest for truth that pulls Tusker into a sinister plot spanning 75 years, from World War II Ceylon to modern day Sri Lanka. Along the way, he matches wits with a psychopathic mercenary, discovers a long lost ship with an explosive secret, and falls for a beautiful marine biologist who is at least as strong as he is. In the end, Tusker finds that the truth may lie at the bottom of the sea, with only one way back to the surface.Depth Charge is an old school thriller in the tradition of Fleming, Maclean, and Cussler, with an eye for detail, cunning villains, and narrow escapes. The story is full of wartime secrets, the intersection of religion and politics, and the arcane world of deep technical diving. It takes readers from the smoky halls of 1940s London to the volatile, seductive heat of Sri Lanka and sixty fathoms under the Indian Ocean. Try not to hold your breath.