It’s Native American Summer Days in Indian Falls, and Rebecca Robbins is roped into taking a turn in the Senior Center dunk tank. That is until her rhinestone-studded grandfather needs help setting up his Elvis act. Now Rebecca has to find a replacement and roller derby girl Sherlene-n-Mean is delighted to fit the bill — until she’s dunked and ends up dead. The cops want Rebecca to stay out of the investigation, but she was supposed to be in that dunk tank, which means her life could be hanging in the balance. Aided by a trio of self-appointed bodyguard derby girls, Rebecca digs for answers, dodges bullets and races to find the killer before the killer finds her.