Clem follows the life of a young teenager, Clémentine, who becomes a mother at the age of sixteen, at the centre of tensions between her parents and Julien, the father of her child Valentin. It deals with the problems of teenage life and that of a mother with a strong personality.

Josephine Delamarre is a guardian angel that Heaven sends to earth. With her psychological insight, ability of persuasion and magical powers, she manages to help people who have problems. She appears at the beginning of each mission; when the mission is completed, she disappears with a click of her fingers.

Gabriel Cauvy contends with the sudden death of his wife, Rebecca, in a suspicious car wreck. When the police blame the crash on Rebecca for drunk driving, Gabriel sets out to clear her name, but his search for the truth is more dangerous than he could have imagined.

When Lola Morand, 25, arrives at the Roches Blanches hotel for a job interview with the hope of being hired as an assistant manager, she quickly becomes disillusioned: there has never been any interview planned.

Christine lost her son at birth 15 years ago. Or so she believes, until she receives a video suggesting he might not be dead. That sends her hurrying back to the island of her childhood in Brittany to discover the truth in an investigation confronting multiple mysteries.