The roughest, scariest and most dangerous roller coaster in the world is "Thrill," the main attraction at the Wildcat Mountain Amusement Park north of San Francisco. When a teenager is thrown to her death in a particularly ghastly manner - the hair-raising scene in this new mystery-thriller by Robert Byrne - the owner of the park agrees to change the ride and make it safer.
"Thrill" as a slow, safe family ride? Over my dead body, threatens the aging, unpredictable Ernest Krevek, who regards his most famous design as an untouchable work of art. Enter Jack McKenzie, the engineer hired to approve the rebuilt ride and Ruby Glouster, a lovely independent-minded young woman who works at the amusement park. As their interest in one another grows so does the unseen fate that stalks them.
When the redesigned coaster is ready to roll, the cars are filled with dignitaries and officials who want to assure the public that every precaution has been taken and that the once-feared monster has been declawed and sedated. But has it? Every inch of the structure has been inspected, extra security is on hand, and Krevek is under observation fifty miles away... and yet...