When Mary, an international art dealer, arrives home after the unpleasant experience of an airplane on which she hoped to fly to America, catching fire, she has the further shock of finding her house occupied by three "strangers" claiming to be her husband, cousin and sister. Even more mysterious is the fact that they seem aware of details of her family life which could only have been known to her most intimate circle. In fact, they even apparently convince a highly suspicious Detective Sergeant.-2 women, 5 men