The Slaves of Paris by Emile Gaboriau

Obedient to the wishes of M. Lecoq, André resigned himself to a lengthy sojourn at the Hospital de Beaujon, and had even the courage to affect that state of profound indifference that had deceived Mascarin. The pretended sick man in the next bed to his told him all that had taken place, but the days seemed to be interminable, and he was beginning to lose patience, when one morning he received a letter which caused a gleam of joy to pass through his heart. "All is right," wrote Lecoq. "Danger is at an end. Ask the house surgeon for leave to quit the hospital. Dress yourself smartly. You will find me waiting at the doors.

-- L."