"Screech! Some major interference is coming through on Walden's hearing aid. But it's not the local radio station - it's a cry for help from the alien colonists called Arrok! Their home has been blasted apart by an asteroid. Can Mr. Kazarian and his student's help? And could the same thing happen to Earth?"

"Mr. Kazarian, the school librarian, is actually an extraterrestrial (with a holographic disguise) studying the behavior of human children. If he wants to continue his research he'll have to find a way to convince the four students who've discovered his secret not to expose him--perhaps by helping their assignment on gas giants with a quick trip to Jupiter." - publisher