Dexter Morgan, a blood spatter pattern analyst for the Miami Metro Police also leads a secret life as a serial killer, hunting down criminals who have slipped through the cracks of justice.

In a Asian desert, a team of explorers learn of a newly discovered cave system and set out to explore it. However as soon as they begin the descent, it becomes clear that this was a secret that should have remained below the surface.

Samantha MacKenzie, the daughter of the president of the United States, arrives at college with a group of Secret Service agents. Samantha, however, resents their presence and decides she wants to attend school just like a normal student. Her father agrees to recall the agents but secretly assigns James, an undercover agent, to pose as a student. They fall in love, but their romance is jeopardized when Samantha learns James' true identity.

The charming and still-single Joey, who has struck out on his own and moved to Hollywood, hoping to truly make it as an actor. After reuniting with his high-strung sister Gina, Joey moves in with Michael, his 20-year-old genius nephew, who unbelievably is literally a rocket scientist. However, what Joey lacks in book smarts he makes up for with people smarts – making him the best new friend his nephew could ask for.

From murder and espionage to terrorism and stolen submarines, a team of special agents investigates any crime that has a shred of evidence connected to Navy and Marine Corps personnel, regardless of rank or position.

Harmon "Harm" Rabb Jr. is a former pilot turned lawyer working for the military's JAG (Judge Advocate General) division, the elite legal wing of officers that prosecutes and defends those accused of military-related crimes. He works closely with Lt. Col. Sarah Mackenzie, and together they do what needs to be done to find the truth.