Adaline Roberts works for the CSI with her best friend, Conner Freeman. They get wind of a murder that took place on a rainy night. Conner and Adaline have to lead the investigation. Adaline learns that Emma Freeman (Conner's sister and her childhood friend) was behind the murder. Emma sends them both notes saying "They are coming." Adaline and Conner have to decipher the meaning of the warning.