People are going missing in Yellowstone, park rangers are finding and then getting rid of bodies, and there is a serial killer in Yosemite National. The witty-cagey, L.A. private investigator Luke Gilroy and his Tasker Team, weave through the many anomalies and paranormal activity that soon haunts them, and two of the greatest parks in the world. Questions were asked and answers must be found. Who is killing? Luke and his men plan on being the first civilian team in the world to bring down a serial killer. And when Yosemite seeks to maintain its image and keep the money and tourism flowing, by hiring a mercenary contractor company to find and secretly kill the Sierra Sam Killer, Luke knows one thing the contractors don't: he found out who the killer is.