On the outskirts of the holiday camp Brightsea in the North East of England lies a mysterious tower. Thought to be long abandoned, nobody pays any attention to the derelict old turret. Until one Summer that is. Wilfred, Emma and Pete Winterthorpe are enjoying a holiday at BrightSea with their parents when one night, they are awoken by a mysterious rumbling accompanied by unusual lights shining from the top of the ancient, ramshackle tower. What, or rather WHO they discover there, soon leads them into an adventure they could never have expected. Their quest takes them into magical places they never knew existed, to meet people and animals they would never have imagined in their wildest dreams. Follow them on their journey to meet a talking badger, the Sky Witches and the Undersea Pirates, and try to guess which majestic creature they will finally meet in the heart of the coastal caves. Will they complete their journey in time to stop a dreadful fate befalling BrightSea?