When Pedro and his dad walk Katie home on a foggy night, something smelly fills the air! With their noses working extra hard, the two friends have a mystery to solve: What is that making that stink, and why is it following them?When Pedro and his dad walk Katie home on a foggy night, something smelly fills the air! With their noses working extra hard, the two friends have a mystery to solve: What is that making that stink, and why is it following them?