(From the publisher):
In twelve dreams, Robert, a boy who hates math, encounters a sly clever number devil who introduces him to the wonder of numbers: infinite numbers, prime numbers, Fibonacci numbers, numbers that magically appear in triangles, and numbers that expand without end. As Robert - and the reader - venture deeper and deeper into this amazing dreamworld, ideas take flight and once-unfamiliar or difficult mathematical theories and principles become crystal-clear.
Original title: Der Zahlenteufel
Genre: Fiction→ Children & Young Adult→ Fantasy