Hilda invites her friends over for muffins, but someone keeps taking them, one by one. Huckle finds clues that reveal the culprit is getting in and out of the house without touching a door or the floor. The mystery is solved when a magpie is spotted, flying into the house through an upstairs window. When Huckle and Sally?s dad finds a stack of cans in his store toppled again and again each morning, Huckle determines to solve the Crashing Cans Mystery by figuring out who is toppling them and how. All the clues eventually lead him to figure that it?s a truck dumping a daily load of crushed stone outside that?s causing the cans to topple.