Fleeting chance

the long version

Fleet and his loyal sidekick are among the passengers on a yacht. A late-night poker game turns unexpectedly eventful when the play is interrupted by a cry of "man overboard." Fleet quickly retrieves the fallen passenger, from the cold waters, but when John returns to the parlor to resume the game, he finds that another player, has been stabbed to death. The death is not the end of the violence, and a disappearance ups the ante significantly.