Two separate cases turn into one when one father turns up dead and his daughter is missing. It all turns out to be due to a slave trafficking ring running in the city. Also Detective Flack is back on duty after having recently being cleared.
Mac and his team investigate when a tough but successful wrestling coach's body is found in pieces all over New York. To make matters worse, during Flack's interrogation of one of the wrestlers, the suspect ends up dead.
Mac runs into Ella McBride who could cost him time in figuring out if Isabelle Vaughn died by eating the miracle fruit. Stella gets in trouble with Mac while investigating another murder linked to the Greek diplomat that attacked her.
When an armor truck is broken into and a guard is found dead, the team finds themselves hampered by a strange energy field that appeared at the time of the incident. Danny pops the question to Lindsay as they continue to explore the future of their relationship.
When three men are found to have been murdered at the same time, Mac realizes that the three men are defendants in an old case of his. As the team processes the evidence, new information comes to light.
The body of a man is discovered dressed as a modern day "Indiana Jones"; Mac and Stella investigate his life. Their investigation leads to an interesting discovery about the man's true identity. Stella finds herself in danger as a result of the investigation from an unlikely source.
When a woman dies in the middle of a street parade, Mac and his team must figure out what happened to her. This investigation leads creates some personal issues for Hawkes and professional issues for Mac.
When a woman ends up dead at a Maroon 5 concert, the team find themselves in danger. They find that the cause of death is linked to several victims over several months. They rush to find the cause of the deaths to save one of their own.