Mischief in Maggody

Nothing ever happens in Maggody, Arkansas (population 755), which is how police chief Arly Hanks likes it. Just back from vacation, she finds a psychic has set up shop in town, some hippies have re-opened the Emporium general store, and the high school has a new guidance counselor. Arly finds no problem with any of the above, but does get alarmed when Robin Buchanon, local prostitute and moonshiner, disappears.
After begrudgingly accepting help from the psychic, Robin’s body is found on the edge of a marijuana field, killed by a booby-trapped shotgun shell. Arly stakes out the field to catch the culprits when they come for their crop, but somehow the marijuana is harvested precisely when she leaves for a few hours. Arly knows her target was tipped off, but by whom? The psychic, the guidance counselor, or the hippies?