Bob the Builder is a very happy man until the day his nice, messy house is infested with elves. The elves tidy up Bob's house till it's horribly clean and bright. They even shine his working boots, polish his hard hat, and put fairy bread in his lunch box. His mates just laugh and laugh. Bob is so embarrassed! But with the help of Lily Sweet, the lady next door, he achieves a compromise, and lots of good things follow.