13 Nights of Hallowe’en by Guy Vasilovich

From chapters.ca:
On the first night of Hallowe'en, what does your mummy give you? A bright, shiny Skeleton Key, of course!  In fact, for each of the thirteen nights leading up to the big night, your mummy is ready with gifts that include everything from singing skulls to demons dancing to icky eyeballs. The spookier and slimier, the better!