Bob and the team are finishing refurbishing the old watermill ready to begin milling the first Sunflower Valley flour. Work is just about to start when Dizzy hears a squeaking noise coming from above. There are bats in the old mill! They weren't there before! This could be tricky as bats are an endangered species. Dizzy is excited, she has never seen bats before. He sends Dizzy and Sumsy to Farmer Pickles silo to collect the seed ready for milling into flour. Bob goes on Travis to see if Wendy can help with the bat problem, while Dizzy and Sumsy race off so they can be back quickly to check out the new discovery. Bob and Wendy decide to speak to Mr Battersby, a bat expert. He reassures them that bats can live quite happily in a working watermill, as long as the team are not too noisy while they are building. Bob and Wendy return to the mill on Scoop. They work as quietly as possible. Dizzy collects the seed but is impatient and doesn't stop to hear that bats only appear at night!