Thasper is foretold to end the rule of the gods with his questioning.
The bizarre panoply of gods are none too pleased with this prophecy, so
send Thasper to a different world in order to prevent it coming to pass.
But Chrestomanci rescues him and sends him home, seven years out of
time. Even the gods cannot cheat their fate.
Andre Norton, Susan M. Shwartz. Empire of the Eagle.