Fifteen-year-old Robert is a dreamer: one evening his eyes blur over and he literally disappears. Robert has become a time traveller, but with little control over his ability he seems doomed to wander forever - until he appears in 17th-century Amsterdam and finds a slim chance of returning home.
Hans Magnus Enzensberger is one of Germany's greatest living writers. In The Number Devil he has written a book that is essential reading for anyone - of any age who has ever been mystified by maths. The author lives in Munich.
