The year is 1961. Chris and Tom Sabo, cousins and best friends, are eagerly looking forward to a carefree summer vacation in their hometown of Elkville, Ohio. Swimming, camping out in the backyard, and exploring the woods and rocks of nearby Cascade Park are only part of their plans for the best summer ever. Eleven-year-old Chris, shy and nervous around girls, anxiously awaits the return of the girl he secretly adores; and Chris knows that with Tom’s wild imagination, excitement and adventure are never far away.
But the carefree summer vacation soon turns into a nightmare, as Cascade Park becomes the scene of a number of unusual accidents. But are they accidents? Could the "witch" who lives in an old mansion next to Marymount Cemetery somehow be responsible, or do the curious happenings in the park involve a distant relative of theirs named Eddie, a strange man who believes himself to be a famous detective?
As the boys learn more and more about the terrifying events, they are propelled into a mystery that reaches its ultimate climax during a violent snowstorm in the wilds of Cascade Park. Only then do they learn the astonishing truth.