During their final summer at Camp Ruby-Spears, old friends Shaggy and Daphne get embroiled in a haunting mystery surrounding a lonely lost Great Dane puppy that may have been a witness to a supernatural murder. Together with the pragmatic and scientific townie, Velma, and the strange, but ever-so-handsome new kid, Freddy, they set out to solve the case that is pulling each of them into a creepy nightmare that threatens to expose all of their secrets.