After thirteen-year-old Hattie Oh casts a dangerous spell so her adopted sister, Riley, will get a share of her inherited magic, Riley must undertake a near-impossible quest to save Hattie from death.--

Like everyone else, twelve-year-old Cleo and her parents are sealed in an apartment without windows or doors. They never leave. They never get visitors. Their food is dropped off by drones. So they're safe. Safe from the disease that nearly wiped humans from the earth. Safe from everything. The trade-off? They're alone. Thus, when they receive a package clearly meant for someone else--a package containing a substance critical for a stranger's survival--Cleo...