En aquesta aventura, els nens i nenes de la casa de colònies de la Napeu viatgen a la Praga de principi del segle XX per trobar l'origen de la paraula "robot".
Màrius Serra i Roig, born in Barcelona, Spain, on May 1, 1963, is a prize-winning Catalan writer, journalist, translator and television host. Serra completed his studies in English philology, and in addition to his writing career, is an English teacher. In 2006 he won the most prestigious literary award in Catalonia, the Ramon Llull Prize, for his novel Farsa (Farce). Though he had already published some works, he first became well-known with the publication of the novel "Mon oncle" (My uncle). He was also the host of a television show about books, Alexandria on Channel 33 in Catalonia. As well, Serra is a frequent contributor to the Barcelona daily newspaper Avui. Besides, he has a section in the program of Radio Nacional de España, "No es un día cualquiera", about crosswords; and another section called "Enigmarius" in Catalunya Radio.