Riverdale: Death of a Cheerleader (Book 4) - Micol Ostow Scholastic

Betty and Veronica's cheerleading retreat with theRiver Vixens was supposed to be fun not deadly.
Betty, Veronica, Cheryl and the rest of the River Vixens are heading out of town for the weekend on a cheerleading retreat. So Archie, Jughead and the rest of the guys decide to have a poker night at La Bonne Nuit. But a storm causes the power to go out, and the speakeasy goes into lockdown. When the lights come back on, all of the cash is gone. The thief has to be someone the guys know but who?