The Titanic secret

Shortly after midnight in April 1912 on Wilhelmstrasse in Berlin, mere yards from the British Embassy, an English spy is shot after a clandestine meeting with a German government official. The spy utters three cryptic words to a sentry, then dies. Gunther Voss, a German financier, is attempting to commit America to join forces with Germany against Great Britain so that Voss can secure for himself the invaluable South African mining concessions. Alex Tremayne of Britain's Secret Service Bureau and Maria Weston, and American agent currently working in Berlin attempt to neutralize Voss' plan before it reaches the States. Will they survive their voyage on the Titanic as they follow Voss?