When a freight and a commuter train collide, Don and his team must not only race against the clock to get the passengers out safely, they must investigate to see whether the collision was an accident or an act of terror.
One of Don and Charlie\'s friends dies in what is deemed an accident. Not convinced, the brothers investigate further and uncover something shocking.
David gets caught up in the drama of a missing persons case when the victim, a magician, disappears while David is watching her show.
There\'s a bad egg in a shipping business, and it\'s up to the team to find him. Also, when one of Don\'s agents is killed, Don begins to question his job as a leader.
Don\'s team helps Agent Bloom, a veteran with the FBI, track down a con man who has eluded Bloom for years. Meanwhile, the final decision on Charlie\'s clearance is handed down, and it doesn\'t just affect Charlie. Don\'s job is on the line as well.
The team takes on the case when eight people, including two police officers are killed in a coffee shop.
Don and the team must go after a group of kidnappers who are taking their victims while stealing their money. The stakes are raised when one of the victims is killed.
Don\'s team gains a new member, while Charlie must deal with the fall out of losing his clearance.
In the season finale, Don and Charlie work together on a case that ends up with them going head to head about their personal beliefs, and one team member will walk away forever.
When a musician is murdered, Don and his team must race to find the culprits. They need Charlie\'s help, but he is busy with Amita\'s parents coming for a visit.