Michael Dahl 
Night Shift [PDF ebook] 

After play rehearsal, schoolchildren board a bus that no one recognizes. Soon, the sky grows darker, the moon and stars arrive early, and the students see something they didn’t expect: the lights of their city far, far below them! The strange bus is drifting into outer space . . . and the students are running out of air. Step aboard the addictively creepy SCHOOL BUS OF HORRORS, where the final destination is never expected.