Sophia Siméonidis, a Greek opera singer, wakes up one morning to discover that a tree has appeared overnight in the garden of her Paris house. Intrigued and unnerved, she turns to her neighbours: Vandoosler, an ex-cop fired from the police for having helped a murderer to escape, and three impecunious historians, Mathias, Marc and Lucien - the three evangelists. They agree - both because they need the money and out of sheer curiosity - to dig around the tree and see if something has been buried there. They find nothing but soil. A few weeks later, Sophia disappears and nobody worries too much until her body is found burned to ashes in a car. Who killed the opera singer? Her husband, her ex-lover, her best friend? Or could it be her lovely niece recently moved to the capital? They all seem to have a motive. Vandoosler and the three evangelists set out to find the truth.