THREE IN THE ATTIC (1968) Christopher Jones

THREE IN THE ATTIC (1968) starring Yvette Mimieux, Christopher Jones, Judy Pace and Maggie Thrett; original screenplay by Stephen Yafa; directed by Richard Wilson In the swinging '60s, three girls discover they have the same boyfriend, who has been playing around with them, all the while vowing fidelity to each. To teach him a lesson he won't forget, the trio contrive to lock him up and continually favor him with their attentions in turn.