Deadly Plunge by Greg Messel

Private investigator Sam Slater is hired to find out why a rich, politically well-connected, San Francisco man, Arthur Bolender, suddenly ended his life by plunging off of the Golden Gate bridge. All those who know Arthur say unequivocally that he did not commit suicide. However, Bolender's body was found floating in San Francisco Bay and, his car was abandoned in the traffic lane of the bridge. Meanwhile, Sam's romance with glamorous TWA stewardess Amelia Ryan continues to blossom and deepen. She is now his secret fiancee. Amelia also eagerly helps Sam solve his cases when she's in town. The key to unraveling the mystery seems to be a strange old Victorian-style house. Bolender's widow, a rich, seductive socialite named Maggie Bolender, was not even aware that her husband owned the house. What is really going on behind the doors of the mysterious house? Finding the answers will plunge Sam and Amelia into a dangerous world of political intrigue in the exciting sequel to "Last of the Seals."