During the 2028 U.S. presidential election a mysterious signal is heard from the wreck of a Nazi World War II U-boat at the base of the Caribbean. The radio signal emanating from the wreck is a simple three word German phrase – “Luzifer ist hier” (“Lucifer is here”). A CIA research vessel is sent to investigate the wreck and the site of the signal. But the U-boat is no longer there – it has been salvaged by sinister German billionaire Leopold Densher in an attempt to rescue priceless art that was being transported from Germany to South America during the last days of World War II.

Source: The Lucifer Signal (Jake Bradley Adventure #1) by Paul Hansen | Goodreads