Caching in (Orca Currents)

Eric and Chris are avid geocachers who stumble into a very strange search for a series of geocaches. At first they are merely curious, but as the stakes rise and the challenges become more trying, the boys get truly hooked. Convinced they are indeed on the trail of treasure, they become consumed with the search, and though their quest tests their strength, intelligence, courage and even their friendship, they don't give up.

"geocaching, treasure hunting, riddles"