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...