Spiral by Mary Jane Bryan

People are dying in the suburbs of Denver, and a young lady from the streets appears to be the latest victim. Thanks to a friend, she doesn’t die, but she does display symptoms of drug toxicity from an unknown substance, similar to the other victims. While investigating the deaths, Detective Colton Mitchell notices a change in his teenage daughter, Abby, who can’t seem to do without the straws of orange candy her new boyfriend gives her. When Colton takes one of the straws to his friend, Jack, the medical examiner, Jack is brutally slain before he can reveal the source of the substance. Looking at a map with pins of the locations of the crime scenes, Colton realizes that the murders have occurred in a spiral pattern, and the spiral is closing in on his house…