Newlywed Elizabeth arrives with her brilliant scientist husband Henry to his magnificent estate, where he wows her with lavish dinners and a dazzling tour of the property. The house staff, Claire and Oliver, treats her deferentially but she can't shake the feeling something is off. Henry explains that everything in his world now belongs to her, all is for her to play in all except for a locked-off room he forbids her from entering. When he goes away for business Elizabeth decides to investigate and finds she may not be who she thinks she is at all.