Imprisoned at the French garrison on the
Isle of St. Noir for putting to death a patient suffering from an
incurable illness, Dr. Paul La Roche escapes to the mainland,
where he meets Dr. Henry Fontaine, his boyhood friend, and
Fontaine's beautiful sister, Yvonne.
As Fontaine is going blind, La Roche
performs several operations for him, attracting the attention of Dr.
Renaud, in Algiers, who offers him a position.
La Roche, practicing as Fontaine,
reveals his love for Yvonne during an excursion to a Bedouin camp.
Then, Lieutenant Destin, from the prison, arrives and threatens La
Roche with exposure unless he surrenders the hand of Yvonne; during
a chess game with Dr. Fontaine, the doctor calls Destin's hand
and shoots him. La Roche saves him with an operation and as a
result is granted a full pardon.