**“This mid-apocalyptic breath of fresh air keeps the reader engaged while undertaking a meaningful exploration of some deep, dark questions.” — *Publishers Weekly*** From *New York Times* –bestselling author Mira Grant comes the final book in the terrifying Parasitology series. The outbreak has spread, tearing apart the foundations of society, as implanted tapeworms have turned their human hosts into a seemingly mindless mob. Sal and her family are trapped between bad and worse, and must find a way to compromise between the two sides of their nature before the battle becomes large enough to destroy humanity, and everything that humanity has built. . . including the chimera. The broken doors are closing. Can Sal make it home? Praise for *Parasite,* book one of the Parasitology series: “A riveting near-future medical thriller that reads like the genetically-engineered love child of Robin Cook and Michael Crichton.” —John Joseph Adams, series editor of *The Best American Science Fiction and Fantasy* “Fans of [the Newsflesh] series will definitely want to check this new book out. But fans of Michael Crichton-style technothrillers will be equally enthralled: as wild as Grant’s premise is, the novel is firmly anchored in real-world science and technology.” — *Booklist* “Sally is a complex, compassionate character, well suited to this exploration of trust, uncertainty, and the price of progress.” — *Publishers Weekly* “It’s a well-grounded medical wariness that gets at the heart of the what the Parasitology series will be asking: What happens when the cure is worse than the disease?” —NPR Books