When Christine Bennett is invited on a sightseeing trip to Arizona, she jumps at the chance for a little adventure. But the excursion reminds her of a former high school classmate, Heinz Gruner, who died 20 years earlier on Cinco de Mayo while hiking Picacho Peak near Tucson. Chris decides to contact Heinz’s mother, who has been wondering all these years how her beloved son, an experienced hiker, plunged to his death. Her one wish is to find out the truth-whether it was an accident, as the police report claimed, or murder. So Chris begins sleuthing-tracking down anyone and everyone connected to her old classmate. Determined to unravel a mystery, if there is indeed one to unravel, Chris will stop at nothing to uncover the dire secrets that exist about that fateful day in May.