Rose is a 26-year-old performer who works for the Silveria Circus as a motorcycle stunt driver and tarot reader. Having fled an abusive home at fifteen, she maintains a nomadic lifestyle and secretly operates as a vigilante under the alias "Sparrow" to protect abused women. She is highly intuitive, courageous, and fiercely protective of those in danger.

Fionn is a doctor living a solitary, highly controlled life in Hartford, Nebraska. He previously worked alongside his brothers as a contract killer in Boston but relocated to distance himself from his violent past. He fills his days with routine medical work, gym sessions, and a crochet club, actively avoiding close relationships to suppress his aggressive impulses.

Matt is a violent local resident in Hartford who exerts aggressive control over his family. His tendency to harm vulnerable people quickly draws the attention of Rose, leading to a brutal confrontation. He acts as a lingering threat to the safety of those around him.

Lachlan is one of Fionn's older brothers, based in Boston. He works as a contract killer alongside Rowan for a dangerous criminal boss. Despite his violent profession, he remains deeply connected to his family, though Fionn currently keeps him at arm's length.

Rowan is Fionn's older brother and an associate of Lachlan in Boston's criminal underworld. He engages in lethal competitions with his partner Sloane but frequently relies on Fionn's medical expertise when their dangerous lifestyle results in injuries.

Lark is Lachlan's romantic partner and a close friend of Sloane. She quickly welcomes Rose into their social circle, offering the isolated circus performer a rare and genuine sense of female companionship.

Sloane is Rowan's romantic partner and a fellow killer who participates in dangerous, competitive games with him. Despite her lethal profession, she is highly perceptive and quickly establishes a protective, trusting dynamic with Rose.

José is the owner and operator of the Silveria Circus. He took a teenage Rose in when she fled her abusive childhood home, giving her a place to live and work. He acts as a guiding, paternal presence in her nomadic life.

Lucy is a local Hartford woman married to Matt Cranwell. Her fearful demeanor and physical bruises quickly alert Rose to the reality of her dangerous domestic situation, prompting Rose to take drastic action.

Eric is a volatile and abusive man married to Naomi Whittaker. His aggressive public behavior and purchase of a firearm immediately mark him as a severe threat, drawing Rose's dangerous attention.

Naomi is a hospital nurse who tends to Rose after her injury. Recognizing Rose from the circus, she privately requests a tarot reading, using the opportunity to seek help escaping her own abusive marriage.

Leander is a powerful criminal boss in the underworld who employs the Kane brothers. He wields significant authority and demands strict obedience from those under his command, making him a looming threat over Fionn's attempts to live a peaceful life.

Callum was the alcoholic and highly abusive father of Lachlan, Rowan, and Fionn. His violent rages deeply traumatized his sons, casting a long, haunting shadow over Fionn's present choices.

Baz is a performer who travels with the Silveria Circus. He assists Rose with minor tasks, such as swiping identification cards, which helps her track down abusive men.