This series is Pike's fight against R.L. Stine's popular Fear Street series. In my opinion, Stine stands no chance. But anyway, here's what the Spooksville series looks like:

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#1 The Secret Path

#2 The Howling Ghost

#3 The Haunted Cave

#4 Aliens in the Sky

#5 The Cold People

#6 The Witch's Revenge

#7 The Dark Corner

#8 The Little People

#9 The Wishing Stone

#10 The Wicked Cat

#11 The Deadly Past

#12 The Hidden Beast

#13 Creature in the Teacher

#14 The Evil House

#15 Invasion of the No-Ones

#16 Time Terror

#17 The Thing in the Closet

#18 Attack of the Killer Crabs

#19 Night of the Vampire

#20 The Dangerous Quest

#21 The Living Dead

#21 The Creepy Creature