King & Kayla are on the case in this laugh-out-loud mystery from the Theodor Seuss Geisel Honor Award-winning series. Kayla made peanut butter treats for Thor, Jillian's new puppy. But now the treats are missing, and King is under suspicion. Analytical Kayla notices that King's breath doesn't smell like peanut butter, so he didn't eat them. Sensitive King detects the presence of an intruder in their house. Is it Jillian's little brother Adam? Or someone else? Who took the missing dog treats?