On May 5, 1945, German U-boat 853 went down east of Block Island after evading capture for nearly twelve hours. Local legend fills the sunken submarine with a fortune in gold bullion, diamonds, and mercury meant to finance a new life for Nazi war criminals in America.

History or legend? The truth would remain hidden for over half a century.

While going through their late grandmother's possessions, Dan, Tom, and Kate Morgan uncover eight messages encrypted with a German enigma machine. Without realizing the link between the encrypted messages and the sunken submarine, they start decoding the messages, setting them on an unavoidable path of collision with others hell bent on intercepting their discovery.

Excitement turns to fear when Kate is abducted. Dan is given seventy-two hours to solve a seventy-year-old puzzle. Fail, and his sister dies.

With each message decrypted, Dan and Tom find their every move hampered at each turn by a mysterious opponent. A secret sank with the Nazi gold-a secret someone wants to remain hidden.

A tense, fast-paced thriller with unexpected twists and turns, Tightrope Walker plunges readers into a world where the crimes of the past leak into the present.