In book 12, the S.S.M.P. needs to track down the boss-monster and get their monster notebook back! Alexander, Rip, and Nikki are keeping their eyes open for clues.

Then Alexander spots Principal Vanderpants carrying a white bucket filled with spaghetti through that mysterious locked door on the 13th floor. Why is the principal acting so strangely? Could SHE be the boss-monster?


【適讀程度】
 Age Range: 6 - 8 years