Fiendish Deeds (Joy of Spooking, Bk. 1)

Joy Wells is a proud resident of Spooking, the terrible town at the top of the hideous hill. At the bottom of the hill is Darlington, a plastic suburban "paradise" where Joy and her brother go to school. When the mayor of Darlington announces that a water park is going to be constructed over the Spooking bog, Joy is horrified. She decides that she has to save the mysterious bog and the endangered species in it - but someone is determined to stop her!