Horrible Harry and the Dead Letters

In room 3B, a donated mailbox becomes the center of a puzzling mystery. Harry, amidst sorting letters, stumbles upon a thief using the mailbox for more than just mail. As special bookmarks vanish, Harry and his friend Doug must unravel the truth. Will they uncover the thief's identity, or will Harry's conclusions lead them astray? With the class immersed in poetry and postal duties, the stakes are high, and the answers elusive. Dive into a tale of intrigue and unexpected twists as Harry navigates the challenges of sleuthing and school life.