Dennis Riordan (Brian Aherne) is the leader of the Irish Rebels. He is still at large because the British do not know what he looks like. Lord Athleigh and his daughter, Lady Helen (Merle Oberon), arrive in Dublin to try to find a peaceful solution to the Irish uprising. Dennis meets Lady Helen under a false identity and they end up falling in love. When she accidently learns his true name, she discloses his whereabouts to the British authorities who arrange an ambush for the next day. Riordan escapes and refuses to believe that Lady Helen was the one who betrayed him. They arrange a secret meeting and she admits that she betrayed him, saying that her action proves they can never be close. Each is unwilling to leave though, and they both declare their love.
Unknown to Lady Helen, the Colonel in charge of the British Occupation had her followed to their secret place. The military surrounds Riordan's flat and prepares to move in. Riordan and his friend, O'Rourke, escape over the rooftops and evade capture. That night Riordan swears that he will never see Lady Helen again. Lord Athleigh takes Helen back to London that night and also makes her promise never to see Riordan alone again.