Phillip is a strapping young man who's been sent to spend the summer with rich relatives at their beautiful country estate. Although there are many outdoor activities to amuse him, including horses to ride and scenic delights for his photography hobby, soon his fancy turns elsewhere... He discovers he can observe his attractive aunt in her bedroom through a perfectly situated keyhole. Consumed with awakening desire, his agonizing, frustrating vigils at the keyhole become an obsession, and he begins to secretly photograph her - in her most private moments and in rapturous lovemaking with her husband. The arrival of an appealing young French maid his age merely fans Phillip's lust for his aunt, and he schemes to have her at any cost... even to using the new maid to lure his uncle away. As he carries out his plan, the film builds to a full realization of Phillip's erotic fantasies... a sizzling climax in the steam summer heat.