Five Lower Merion detectives from the Hill take a fishing boat out of Cape May to fish for tuna 50 miles out. The boat disappears, and the Coast Guard says it has sunk. But one detective doesn't believe it and begins his own search.You won't believe what he finds, and neither will anyone else.

Camping in Croyle's woods, the four Hill tough kids see a package dropped from a helicopter. Opening the package takes them to the Hill in the year 3024. You won't believe what they find.

A family of 12 moves to the Hill, and the kids start to disappear one by one. The police scratch their heads, but they soon discover there is a secret passageway in the basement. But where does it lead, and who will try to find out? Another unputdownable Costello.

In a rare night class at Lower Merion High School, the students view the universe from a homemade telescope. A student — detective George Rausher's son — forgets everything. Total amnesia. 

The Philadelphia mob is under attack by FBI electronic surveillance, but Angelo Bruno believes a move to the Hill will help. It's not long before the mob runs into trouble with the Hill's Ass Kicking Hall of Fame. I

A Native American family moves onto the Hill with a strange dog. Only the dog isn't a dog, it is a wolf as old as the earth. Suddenly, people on the Hill begin to have flashbacks showing how their souls developed at the dawn of time.