Who Wants Tyler Dead?

Marielle Jones has been hired to drive 8-year-old Tyler, his 10-year-old sister and their maternal grandmother on a camping trip across Oregon. When Tyler claims someone pushed him into the river, Marielle refuses to believe him. But, later, the party is shot at, and Marielle realizes something scary is going on. Is it possible someone wants an eight-year-old kid dead? Why? In the musty, dank corridors of an historic old military fort, astonishing answers emerge.