As Sabri's birthday approaches, Professor Strauss is distraught by the loss of the album containing his stamp collection. Sabri and Jamel endeavor to retrieve the stamps as Aymé tries to find somebody to spend the night with.
In order to buy time to seduce her attractive friend, Aymé prolongs a patient's stay. Sabri struggles with a new intern with proximity issues. Prof. Strauss' memory is failing. Jamel worries he won't get back the money he lent Béatrice.
Jealous of Sabri's friendship with a stuntman patient, Aymé finds himself a new best friend of his own. Jamel wants Clara to free him a morning to attend a "Mary Ingalls" meet-and-greet. Prof. Strauss is on the trail of an escaped python.
With his sister interning at the hospital, Jamel makes Aymé promise he will stay away from her. A conversation with Béatrice turns Sabri into a firm believer in reincarnation. Prof. Strauss solicits Clara's help to win back his ex-wife.
Sabri acquires a watch that brings him bad luck. For some alone time with his girlfriend, Jamel covets Aymé's apartment while he attends his father's rewedding in Corsica. Prof. Strauss aims to hide his assets to a tax controller.
To be free the week when Clara planned to travel, Jamel fakes an illness. Aymé is happy to buy back Clara's vacation package to spend time with her beautiful friend, but things pan out otherwise. Clara uses Sabri to get back at Jamel.
When Clara announces he will start sharing his desk hours with a woman, Jamel poses as his own female cousin to secure both shifts, but things get complicated when love interferes. Prof. Strauss prepares to attend a congress in Sydney.
A suicidal patient asks Aymé to read the manuscript he wrote. To cover up its loss to the man's mother, the staff comes up with an ingenious idea. Jamel's lie about dating a neurology nurse ends up serving him well.
Jamel and Aymé become attached to the bunny Béatrice bought to be the meal at the upcoming service dinner. As Pierre Palmade writhes in pain from a smashed knee, Sabri plans a successful double act with the comedian.
Dreading being drafted, Aymé and Sabri try to find a way to be exempted from service. The hospital ladies have a new pant uniform, and Clara is out to prove that she can wear the same size as a smaller colleague.