A completely off-the-grid, former Army investigator who leads the series and provides the primary connective tissue between all four seasons. His methods are brutal, and this time around, he dives deeper into a conspiracy than ever before.

What else you’ve seen him in: “Playdate,” “The Ministry of Ungentlemanly Warfare,” “Ordinary Angels,” “Flipped,” “Fast X”

After taking a stand against corruption in her city, this Philadelphia native gets stuck on the night shift and begins investigating a seemingly routine case that doesn’t add up. She’s the kind of investigator who won’t let go of her gut feeling.

What else you’ve seen her in: “Glow,” “Black Panther,” “Arrow,” “Captive”

A small-town cop from New Jersey who travels to Philadelphia in search of answers after his adopted daughter suddenly dies. He isn’t leaving until he has answers.

What else you’ve seen him in: “Just Friends,” “The Girl Next Door,” “Barry,” “Hawaii Five-0”

An off-the-radar investigative journalist who has spent years building a case against the government’s most secretive operations.

What else you’ve seen him in: “Alias,” “Marvel’s Runaways,” “Scorpion,” “Flipped”

Lila arrives in Philadelphia in search of her estranged father, a powerful politician. When she and her mother arrive in the city, it sets in motion an unexpected series of events.

What else you’ve seen her in: R&B singer, Indonesia’s most awarded artist

Once a political dissident who survived atrocities against her country carried out by a power-hungry general, Amisha has sacrificed everything for her daughter, Lila.

What else you’ve seen her in: “Levitating,” “Cannes Confidential,” “Leo Mattei – Special Unit”

Marc Blucas stars as the charismatic congressman, John Sampson, whose secrets are on the brink of being unveiled in Season 4. Currently the frontrunner for his party’s presidential nomination, Sampson was previously stationed in Indonesia for Delta Force.

What else you’ve seen him in: “First Daughter,” “My Life With the Walter Boys,” “Buffy the Vampire Slayer”

Congressman John Sampson’s wife, Elsbeth Sampson, is played by Kathleen Robertson. As her husband increasingly faces conflict, Elsbeth never leaves his side and is undoubtedly the closest person to John. 

What else you’ve seen her in: “Boss,” “Scary Movie 2,” “Tracker,” “Northern Rescue”

Kevin Corrigan stars as Detective Shaun Docherty, Tamara’s cynical partner who’s vocal about his skepticism (but he’s usually right). Although he’s prone to complaining, the dry-humored detective is there for those around him in moments of need, especially Tamara.

What else you’ve seen him in: “Grounded for Life,” “The Chaperone,” “Hit and Run,” “Pineapple Express”