Basalt is south of Glenwood Springs and north of Aspen.
The Aspen Times reports that a 15-year-old in the case confessed that he and three other boys planned to lure a young man to a park. Then they were going to beat him with baseball bats, tie him up and dump him near a reservoir.
A police report says they planned to let him starve to death.
No kidnapping or assault actually took place, but the parents of the boys turned over a hand-drawn map that showed something was planned.
The four boys could now face criminal charges. Their identities were not released.