Caitlin Keats

The team must put their holiday decorations on hold to investigate a Marine's death by his cell phone blowing up. They begin to realise that they need to locate his former unit to protect them from further explosions.

A scientist is deliberately exposed to a deadly toxin at a high-security biological research facility. Before she dies, she calls Jane to ask for his help in finding her killer. Once the agents have arrived on scene, however, another empty flask of the toxin is discovered, suggesting all those inside the facility have just hours to live.

When Billie begins seeing another man, Zack starts to show his jealous tendencies.