"So Gramp’s time machine actually works! Fourteen-year-old Susan Ferguson is startled when she’s catapulted into the wild streets of 1872 Manhattan—where danger and adventure await at every turn. The errand she volunteered for is scary enough—to bring home a brain that holds the key to her grandfather’s survival—but her mission quickly spirals into chaos when she has to navigate a perilous landscape filled with street gangs, narrow escapes, and diseases from a bygone age.