12 books in series

Peter Grill and the Philosopher's Time 2
Peter Grill and the Philosopher's Time 3
Peter Grill and the Philosopher's Time 4
Peter Grill and the Philosopher's Time 5
Peter Grill and the Philosopher's Time 6
Peter Grill and the Philosopher's Time 7
Peter Grill and the Philosopher's Time 8
Peter Grill and the Philosopher's Time 9
Peter Grill and the Philosopher's Time 10
Peter Grill and the Philosopher's Time 11
Peter Grill and the Philosopher's Time 12
Peter Grill and the Philosopher's Time 1

Band 1