The series follows the adventures of the ingenious but tormented Imogene Scott, who, by finding herself in the wrong place at the wrong time (well, she has a little to do with it), becomes the prime suspect in a homicide, the unfortunate man having been murdered in a locked room. The setting: a sumptuous Mediterranean cruise ship. The suspects: all the wealthy passengers, whose every whim is catered to, and the crew, who go out of their way to meet their demands. The catch: to prove her innocence, Imogene must collaborate with a man she finds insufferable, Rufus Cotesworth, considered the world's greatest detective.