内容简介：
What could be more fun than four close friends on a cruise? The trouble begins when one of them becomes the only witness to a horrifying murder. To keep her from testifying, the resourceful killer follows her and her friends from a ritzy Florida resort, to the fun and frolic of a luxury cruise ship, and right across the US/Canada border, to the awesome cataracts of Niagara Falls. HE THREATENS, HE TEASES, HE KILLS The killer keeps one step ahead of the police by using clever disguises. The friends keep one step ahead of the killer by plain dumb luck. The stalker's devilish plan is to kidnap the witness, and throw her over the roaring, tumultuous, unforgiving falls. The chief detective has a hidden agenda. Because he is in love with the witness, he will do anything to keep her safe. Can the wife killer really get the best of his intended victim? She escapes one attempt after another, until, finally, he succeeds in kidnapping her. Can anyone possibly rescue her in time to save her from a watery demise, when she finds herself at the very brink of the Horseshoe Falls?