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.