Iris Carr is a beautiful, young socialite on her way back home to England after vacationing in Europe. Feeling terribly alone and afraid, she finds comfort in the company of a strange woman she knows only as "Miss Froy." But comfort soon turns to horror when Miss Froy mysteriously vanishes without a trace. Fearing madness, risking death, Iris desperately tries to solve the sudden disappearance of her traveling companion-a woman no one else on the journey remembers seeing at all!