Eleven-year-old Gregor and his younger sister, Boots, return to the Underworld beneath New York City to find the cure for a terrible plague that threatens the life of their mother, as well as the lives of the people, bats, and rats who populate the underworld.
Thirteen-year-old Lizzie and her secret friend Noah, who is hiding in her house, plan to rescue Noah's father from the quarantined Chinatown, and save everyone they love from contracting the plague that is spreading in 1900 San Francisco.
"With a mix of sidebars, illustrations, photos, and graphic panels, this book uncovers the hidden truths about history's pandemics, from the Black Death to COVID-19"--