It's late summer 1793, and the streets of Philadelphia are abuzz with mosquitoes and rumors of [yellow] fever. Down near the docks, many have taken ill, and the fatalities are mounting. Now they include Polly, the serving girl at the Cook Coffeehouse. But fourteen-year-old Mattie Cook doesn't get a moment to mourn the passing of her childhood playmate. New customers have overrun her family's coffee shop, located far from the mosquito-infested river, and Mattie's concerns of fever are all but overshadowed by dreams of growing her family's small business into a thriving enterprise. But when the fever begins to strike closer to home, Mattie's struggle to build a new life must give way to a new fight—the fight to stay alive