United Middle Schooll Mysteries Book 3

A horrible stench fills the hallways with no clear source, a history teacher seems to be hiding a secret, and a mysterious machine in the basement is causing eerie do-overs throughout the school. Each twist leads to more questions, and time is running out to uncover the truth before the chaos gets out of control!Can the Young Investigators solve the puzzles, catch the culprits, and restore order before United Middle School is thrown into complete mayhem?