Sage Caplin is taking her Portland coffee cart on the road to a sustainable music festival, but murder is an unwanted special guest … At Campathon, an annual eco-friendly festival held on a farm outside of Portland, fans celebrate the Pacific Northwest's music scene in quintessential PDX style—with gourmet food carts, reusable utensils … and lots of coffee. How else to get through three days of nonstop entertainment? Sage has scored a coveted place for her Ground Rules coffee cart thanks to her new-ish boyfriend, Bax, who's friendly with Maya, one of the musicians performing. The festivities begin with a stream of customers, friends, and acquaintances stopping by for Ground Rules' world-class blends, expertly brewed by Sage and her newest barista. But there are tensions between Maya and her former bandmates, who are on the cusp of making it big, and with Ian, the band's manager. When Sage stumbles upon Ian's dead body in the nearby woods—his hand still clutching one of her coffee mugs—it's clear that someone's grudge boiled over into murder. Can Sage work out who's responsible before another innocent life fades out, and the curtain falls on Campathon, and maybe her own future, for good?