Seven Deadly Colors Of The Rainbow [#Wattys 2016]

A young lady has been found dead in her bathtub at her apartment. At first glance anyone could rule it as an accidental suicide as a hairdryer was found in the bath. Anyone but Detective Courtney Anderson. After an odd bright card captured his attention, the detective figured a killer was at large. Two more female victims show up both dead but with no type of afflicted bruises. Carefully considered deaths.
As two more calling cards appear both of equally bright colors, three pieces of the puzzle came together and the Rainbow serial killer identity was coined for the mystery murderer.
With the dead bodies piling up and no apparent link between the victims, Detective Anderson feels the pressure from his superiors to bring this guy to justice. With he aid of his new partner, he seeks out a connection.
Who is this mystery man?
What is his motive?
Can the Detectives put a stop to the murders before another body shows up?
Find out in The Seven Deadly Colors Of The Rainbow.