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.
Series:
Doctor Proctor's fart powder Nesbø, Jo, 1960- Doktor Proktors prompepulvet. English.
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