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Summary
Harry and his detective classmates try to find clues relating to a mysterious locked closet in Room 3B. Horrible Harry has discovered the biggest mystery ever in Room 3B! There's a locked closet in the classroom that's been sealed off for years, and he wants to find out what's inside. Harry can't so... Full description
Series: Horrible Harry
Horrible Harry in room 2B (Volume 1.)
Horrible Harry and the green slime (Volume 2.)
Horrible Harry and the ant invasion (Volume 3.)
Horrible Harry's secret (Volume 4.)
Horrible Harry and the Christmas surprise (Volume 5.)
Horrible Harry and the kickball wedding (Volume 6.)
Horrible Harry and the dungeon (Volume 7.)
Horrible Harry and the Purple People (Volume 8.)
Horrible Harry and the Drop of Doom (Volume 9.)
Horrible Harry moves up to third grade (Volume 10.)
Horrible Harry goes to the moon (Volume 11.)
Horrible Harry at Halloween (Volume 12.)
Horrible Harry goes to sea (Volume 13.)
Horrible Harry and the dragon war (Volume 14.)
Horrible Harry and the mud gremlins (Volume 15.)
Horrible Harry and the holidaze (Volume 16.)
Horrible Harry and the locked closet (Volume 17.)
Horrible Harry and The Goog (Volume 18.)
Horrible Harry takes the cake (Volume 19.)
Horrible Harry and the triple revenge (Volume 20.)
Horrible Harry cracks the code (Volume 21.)
Horrible Harry bugs the three bears (Volume 22.)
Horrible Harry and the dead letters (Volume 23.)
Horrible Harry on the ropes (Volume 24.)
Horrible Harry goes cuckoo (Volume 25.)
Horrible Harry and the secret treasure (Volume 26.)
Horrible Harry and the June box (Volume 27.)
Horrible Harry and the scarlet scissors (Volume 28.)
Horrible Harry and the stolen cookie (Volume 29.)
Horrible Harry and the missing diamond (Volume 30.)
Horrible Harry and the hallway bully (Volume 31.)
Horrible Harry and the wedding spies (Volume 32.)
Horrible Harry and the top-secret hideout (Volume 33.)
Horrible Harry and the birthday girl (Volume 34.)
Horrible Harry and the battle of the bugs (Volume 35.)
Horrible Harry and the Field Day revenge! (Volume 36.)
Horrible Harry says goodbye (Volume 37.)