I'm A Stranger(1952)

When his grandfather dies, George Westcott (Patrick Doonan) returns home from India to collect his inheritance -- only to find that the will has mysteriously gone missing. As his greedy relatives try to seize the estate, George gets the help of a movie star (Greta Gynt), a window cleaner (James Hayter and a police inspector (Herbert Ross) to track down the missing will. It seems that justice will prevail -- but is George Wescott really George Wescott?