Travelling home from a European holiday, Iris Carr ends up alone at the station after a quarrel with her friends. Struck by a mysterious assailant and waking up just in time to board the train which will take her on her journey to London, things seem to be looking up after a chance meeting with the affable Miss Froy. But when Iris passes out and reawakens, Miss Froy is nowhere to be found. The oth...