Ruben Brandt, a famous psychotherapist, is forced to steal 13 paintings from world-renowned museums and private collections to assuage his suffering from terrible nightmares. Accompanied by four of his patients, he and his gang of thieves strike regularly and with great success: the Louvre, Tate, Uffizi, Hermitage, MoMA... "The Collector" quickly becomes the most-wanted criminal. Gangsters and headhunters chase him around the world, while the reward for his capture keeps rising, nearing $100 million. A group of insurance companies hires Mike Kowalski, a private detective and leading art-theft expert, to solve the case.