Beth Chadwick has lived all her life controlled first by her father, then after his death, by her brother Bryce who manages the family business. Now she has fallen for Peter Hamilton, who works for Bryce. But, as usual, Bryce objects to her choice and threatens to fire Peter. So Beth decides to murder her brother and to do it in such a way to let it to appear like an accident. Lt. Columbo realizes at once the truth and starts looking for evidence.