by Mark Haddon (who also wrote The Curious Incident of the Dog in the Night-Time)
After Jim's big sister tells him he's being sent to the "special" school because of his poor school habits, he and his friend Charlie put a walkie-talkie in the teacher's lounge to see if it's true. (Although Charlie seems to have his own motivations.)
At first, they are bored, but suddenly they hear two of their teachers speaking a different language that they can't identify. When they investigate further, strange things begin to happen. Could their teachers possibly be aliens?
This is a fun tale -- outrageous and often silly, with kids who act like kids.
Note: There is an alien who calls itself Britney; I wonder if this is a nod to J.Lo in Adam Rex's The True Meaning of Smekday, or if great minds just think alike?