When Lindsey Parker's widowed father announces that he is to remarry, Lindsey does what any good daughter would do: wishes him congratulations then sets about trying to kill his fiancee, Karen. Fortunately, the murder attempt fails but Lindsey still succeeds in driving Karen off. It doesn't take long, however, before Lindsey realises that her father's heart really is broken and the only way to mend it is by getting Karen back.

But Karen is already seeing someone else - a mysterious entrepreneur. Lindsey decides to enlist the help of an old schoolmate-turned-private detective to break this new couple up. But as her plan gets underway, Lindsey senses she is falling for the very person she needs to drive away...