Contagion by Teri Terry Callie is missing. Her brother Kai is trying everything he can to bring her home again, continuing the investigation even after the police have given up. Just when he’s about to admit defeat, he meets Shay, a girl who spoke to Callie on the day she disappeared. After speaking to Shay, he begins to hope again that he might be reunited with his little sister. Shay becomes entangled in the search, but they soon realize that Callie’s disappearance is only the beginning. There’s a terrifying epidemic sweeping across the UK, killing almost everyone it contaminates, and the mystery of Callie going missing seems to be at the…