Rogue Kelly A New York detective who relocates to Nashville to investigate a series of disturbing crimes. Brilliant, unconventional, charismatic, and difficult to read, Rogue has a talent for profiling criminals. He finds Rayan's curiosity interesting, and their conversations gradually become more personal than either expects.

Roxie Alba A fearless firefighter and former trauma surgeon. Roxie thrives under pressure, trusts her instincts, and brings valuable medical expertise to emergencies.

Blue Bennings Don's biological son with Dixie and Rayan's half-brother. Blue is a troubled but determined young man who becomes a firefighter cadet at the 113. He's still learning to trust his new family and find his place in the firehouse.

Captain Don Hart The experienced captain of the 113 and Rayan's father. Protective, disciplined, and stubborn, Don takes his responsibilities seriously and isn't particularly fond of Rogue's unconventional methods.

Blythe Hart Rayan's mother and Don's wife. Elegant, intelligent, and socially connected, Blythe comes from a wealthy family. She tries to keep her family together despite the tension surrounding her marriage

Cammie Raleigh A 911 dispatcher and Blythe's sister-in-law. Calm, capable, and compassionate, Cammie helps coordinate emergency responses and is an important connection between dispatch and the 113.

Taylor Thompson A talented firefighter and singer. Taylor is hardworking, confident, and passionate about both her career and music.

Dixie Bennings Blue's mother, a country singer and Don's former girlfriend. Bold, passionate, and outspoken, Dixie has a complicated history with the Hart family, particularly Blythe.

Samantha Hart Rayan's wife and an emergency-room doctor. Intelligent, compassionate, and independent, Samantha balances her demanding medical career with her complicated family life. (I suspect she is cheating, this is only for the plot)