"Calling the pilot of space ship X911!" Evan Harwich shouted into the radio transmitter of his little Interplanetary Patrol Boat. "Good God! Turn your crate back, you crazy fool! Don't you know you're headed right into the danger zone of Jupiter's Forbidden Moon? You'll get yourself burned to a crisp in another few seconds if you don't turn back...." Evan Harwich's growling voice was almost shrill at the end. His police duties patrolling the vicinity of Io, innermost of Jupiter's larger satellit