One minute Hannah Baker is a quiet science professor. The next, a possible murder suspect. Six victims, one per week, all poisoned with the same exotic Hannah once worked with. Now she is wanted by Houston detective Owen Randall--but is it to enlist her help, or arrest her? Owen knows the prim Hannah is hiding something, but he is not sure she is a killer. Especially after some unfortunate incidents. Is she the next victim of the chemical killer? Torn between duty and his growing feeling, Owen only knows he has less than a week to save her.