When Koko, Katie's new white puppy, is scared by a noisy truck and runs away, Katie and Pedro try to track her down in the snow, following several false leads until they finally see Koko.
Katie has bought a box of chocolates for her mom's birthday, but when they go to open it the box is missing, and Katie and Pedro set out to track down the thief.
Pedro forms a new club with his friends dedicated to solving mysteries--and the first two assignments are finding his mother's locket, and his father's cell phone.