Don (Onslow Stevens) and Ralph (James Bush) are returning to the US from the South Seas after years away, Ralph returning home after the unexpected death of his father. After an accident on board their ship, Ralph is injured.
With Ralph's blessing Don poses as Ralph to go home, though he encounters Ralph's long-standing fiancée Sylvia (Janet Chandler) and falls in love with her. However, it is Don who is soon put in danger as it appears that the butler Gordon (Desmond Roberts) and Ralph's cousin Martin (John Andrews) are up to no good...
Although it is pretty clear from the off who the villains are, this is a fine crime drama with some good performances (though not universally, some of the dialogue can be a bit stilted at times) and a decent plot.