Doctor Proctor sets off for Paris to find his old love, Juliet Margarín, again. One day, a special postcard appears in Líza Pedersenová's mailbox in Dělova Street. It's from Dr. Proctor. Líza and Bulík finally manage to decipher the message and discover that Dr. Proctor cannot get back from the past without their help. But why is his message encrypted? Is he in any danger?

The doctor's loyal friends soon find themselves in Paris, where they meet Juliet. These former lovebirds had to split up under very dramatic circumstances almost forty years ago, and now Dr. Proctor has set out with the help of his old invention, the time tub, to change the course of events back then. However, he failed to return to the present, and the only thing that floated out of the bathtub where Julieta was waiting for him was a postcard addressed to Líza. So there is nothing left but for Líza and Bulík to take the bath of their lives and go into the past to help Doctor Proctor.

Jo Nesba's first children's book Doctor Proctor and the Fart Powder garnered enthusiastic critics. Get ready for a frantic ride through time in this fun and thrilling sequel to Dr. Proctor.