The agency is hired by mechanic Jerry Adams following the death of his business partner, modified stock car racer Suzy Lemson. Suzy died in a race accident at Corbin Speedway when her car exploded upon impact hitting a wall. Jerry, who built Suzy's car, believes that Suzy was murdered, which he cannot prove on his own not having access to her car following her death to see if it had been tampered with to cause the crash when the car was bumped by fellow racer, "Bloody" Mary Barrows. Beyond Mary whose track exploits are regarded as less than ethical, the other leading suspect is Mary's mechanic, Ted Kale, who had a thing for Suzy. Another reason Jerry is suspicious is that Suzy had been worried about something unspecified the few days leading up to the race, this which Kelly is able to confirm with Suzy's unsuspecting parents by their worried silence. Shortly into the investigation, two further suspects emerge: Eddie Dirko, Suzy's ex-boyfriend from South Carolina who has recently been seen around the track; and Gene Wells, the track promoter. Sabrina has arguably the most difficult undercover role in this case as Jerry's new driver, she who not only has to appear legitimate in her race driving skills, but who may meet the same fate as Suzy, especially if the case extends into the upcoming Corbin to Baja race across the border into Mexico.
—Huggo