a young woman ( jean simmons ) be convince by her scheming and dangerous aunt ( sonia dresdel ) and uncle ( barry jones ) that she lose her mind and in very delicate condition that require their supervision which turn out to be more like manipulation and a they try to keep her a far away from outside human contact a possible . the only other person she see be the estate caretaker and a lascivious character play by maxwell reed and whose catch the wayward eye of the middle age aunt . all of this and the aunt and the caretaker and the butterfly expert uncle who have a serious underside to him and and the susceptible niece in the middle and would have make for a darker and more sinister film . a it be and a frame up for a murder send trevor howard ( a fire government secret service agent who take a job at the estate catalog butterfly ) and simmons across the countryside escape police and catch headline of police net closing in over her front page photo and hop on bus and and wind up in liverpool and where they meet some wonderfully cast character and and finally face down the greedy and murderous aunt and uncle .