Vivica A. Fox at the helm of true crime series, 'The Interrogation Room'

Vivica A. Fox has played plenty of roles during her career.

She’s learned to observe the signs.

And how to detect changing stories, as well as spotting when to hold back and when to close in.

These are the lessons she uses as the host of the FilmRise series, “The Interrogation Room.”

The true-crime series takes an in-depth, inside look at the battle of wits between police and detainees in some of the most disturbing cases in the United States and the United Kingdom in recent years.

The 10-episode series is streaming on Amazon Freevee, Tubi, The Roku Channel, Pluto TV, Samsung TV Plus and FilmRise’s own free streaming apps.

“These stories really tug at your heartstrings,” Fox says. “Most likely when they bring in a suspect there are twists and turns because of the denial. Each case has a lot of lies and manipulations. That’s the beauty of the series because we focus on the skill of the investigators who let the suspects marinate by sitting in the rooms by themselves. This is what makes our show a little bit different.”

Fox says the series gives viewers unprecedented insider access to interrogation rooms as seasoned detectives break down the suspect’s lies and gather the information they need to bring justice to victims and their families.

Alongside world-class experts, in every episode Fox reveals and explains the master techniques that investigators use to obtain the all-important confession, as well as uncover the tell-tale signs exhibited by those being questioned — from body posture to language and beyond.

Each episode of the series opens the interrogation room door to a different crime.

The first episode tells the true story of Melissa Huckaby.

It follows when 8-year-old Sandra Cantu from Tracy, California, vanishes and the community works together to find the missing child. Police turn their attention to Huckaby, a neighbor who, in her willingness to help, leads investigators to believe that her disappearance could be rooted in something more sinister.

“I believe that the true crime genre is so popular and people are always recording today,” Fox says. “I know those videos help detectives. Officers are wearing body cams which helps keep people from manipulating and lies. There’s one person that doesn’t lie — that’s the camera.”

While the cases are heartbreaking, Fox finds a sense of hope within the stories.

“I want viewers to take away the victory for the victims,” she says. “Their names are not lost in vain. It’s about following the path to justice.”

Fox jumped at the opportunity to host the true crime series, as she’s always been a fan of the genre.

“I grew up on ‘48 Hours’ and ‘Dateline,’ ” she says. “I did my homework in getting it right. With the series we add a little something different. I add flavor to what I do.”