Season 2 ends with the Cyber team searching for the hacker who stole millions of federal employee files, resulting in the largest breach of highly classified data in history. Meanwhile, Avery and her ex-husband have a candid talk; and D.B. considers a future with Greer.
The team investigates when users of a traffic app are rerouted to remote locations and robbed by masked women. Meanwhile, Russell reconnects with Greer Latimore after the team completes business in Los Angeles.
The team investigates what appears to be a hack into air traffic control's communication system, but a greater threat emerges when a flight vanishes into thin air, and the team is drawn into the world's first case of cyber-hijacking.
A hacker takes control of all networked medical devices at a Dallas hospital and threatens to kill one patient every hour if his demands are not met. The Cyber team work to locate the source and figure out how the culprit accessed an airtight security system.
The team investigates a child-abduction case based on an online myth in which an abductor lures children through a cell phone app. Meanwhile, Elijah's aggressive behavior at work causes Avery to bench him; and romance is the air for D.B.
Raven's friend is accused of murdering a man she met through a dating app who hacked her accounts, stole her money, and caused her to be fired and evicted. To make matters worse, she is found with the murder weapon in a motel room where she woke up with no memory of what happened.
Season 2 begins with former Las Vegas CSI D.B. Russell joining the team as they investigate a burglary/homicide committed by someone who remotely hacked the victim's home security system. Meanwhile, Avery considers moving to a new position; Krumitz is a witness in his sister's trial; Elijah deals with a delicate family situation; and further information is revealed about Nelson's and Raven's backgrounds.