Title: Bubble in the Bathtub
Description: A mysterious postcard leads Lisa and Nilly from Oslo to Paris in search of Doctor Proctor but, once there, all they find of their missing friend is a time-traveling bathtub powered by a special soap and several sinister individuals determined to do all they can to locate the eccentric inventor.
Subjects: Fiction, Humorous stories, Time travel, Adventures and adventurers, Inventors, Adventure and adventurers, Juvenile fiction, Adventure stories, Bathtubs, Children's fiction, Time travel, fiction, Inventors, fiction, Adventure and adventurers, fiction, Paris (france), fiction, France, fiction