"The Coldest Girl in Coldtown" is a young adult novel by Holly Black that explores a world where vampires exist and are quarantined in dangerous places called Coldtowns. The story follows a teenage girl named Tana who wakes up after a party to find her friends dead and a vampire named Aidan infected but still alive. As Tana navigates her way through the chaotic world of Coldtowns, she must confront her fears and make difficult choices about love, survival, and the nature of humanity. The novel blends elements of horror and romance, creating a unique take on vampire lore.