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.
After learning about mummies in class, Katie decides to make one of her own, but when it suddenly goes missing, Katie and Pedro start following clues that they hope will lead them to the missing mummy.
When Katie's father looses his special rainbow ring while playing with the kids in the backyard, Katie and Pedro work to follow the clues to find the missing ring.
Pedro and his dad are walking Katie home on a foggy night when they are seemingly pursued by something very smelly, and Katie and Pedro try and solve the mystery of the big smell.
Katie and Pedro are enjoying a night of camping, but when it gets dark and Katie starts to feel nervous, her father reassures her it will not last long, for tonight the Moon will be particularly bright.
Katie, Pedro, and their mothers are going canoeing, but when the two canoes get separated Pedro gets worried that something has happened to his friend.
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.