Emily is given the flour route for the summer, and James warns her of a monster in Black Loch. Emily's trucks cause her to crash and be late, so the Fat Controller transfers her to the Black Loch route. Emily is scared, but perseveres and discovers what the "monster" really is.

Percy is taking passengers for the first time in a long time, so Gordon teaches him how to treat coaches. Gordon uses this as an opportunity to show off, which leads to trouble.