Division Zero Series by Matthew S. Cox

Most cops get to deal with living criminals, but Agent Kirsten Wren isn’t most cops. A gifted psionic with a troubled past, she possesses a rare combination of abilities that makes her a powerful weapon against paranormal threats. Adrift in a society that fears people like her, she feels alone in a city of millions. In 2418, rampant violence and corporate warfare have left no shortage of angry wraiths... moreMost cops get to deal with living criminals, but Agent Kirsten Wren isn’t most cops. A gifted psionic with a troubled past, she possesses a rare combination of abilities that makes her a powerful weapon against paranormal threats. Adrift in a society that fears people like her, she feels alone in a city of millions. In 2418, rampant violence and corporate warfare have left no shortage of angry wraiths. Most are little more than fleeting shadows or eerie whispers in the darkness, but every so often, one gathers enough strength to threaten the living. A series of attacks by androids known as dolls leave the normal police baffled. Unable to explain what made the machines malfunction, they punt the case to Division 0. Kirsten’s investigation into who – or what – is behind the random murders soon makes her a target for corporate assassins. Despite her past, and the cynical city around her, she clings to the belief that no one is beyond redemption. Alas, the killer is desperate to claim as many innocent souls as possible, and one might just be hers. less

Some soldiers don’t let anything sway them from their mission—not even death from high explosives. Free from her troubled past, Agent Kirsten Wren finds peace in mentoring Evan, a little boy with psionic talents similar to hers, and soon develops strong protective feelings for him. A team of corporate “issue resolution consultants” tears up the city, continuing their mission to kill a man in the afterlife... moreSome soldiers don’t let anything sway them from their mission—not even death from high explosives. Free from her troubled past, Agent Kirsten Wren finds peace in mentoring Evan, a little boy with psionic talents similar to hers, and soon develops strong protective feelings for him. A team of corporate “issue resolution consultants” tears up the city, continuing their mission to kill a man in the afterlife. Kirsten pursues the unusually potent spirits, trying to stop their rampage before more people die. Her investigation leads her to a strange ritual circle that gives off energy darker than any wraith she has yet encountered. Unable to make sense of the ancient pictographs, she seeks help from the only person in the area capable of understanding them, an enigmatic billionaire who takes a strange fancy to her. His opinion that she’s chasing demons calls into question everything she believes. Kirsten’s not about to let superstition scare her away from protecting an innocent ghost. Alas, the demons give her an impossible choice: back off and let a man die—or they take the boy she considers a son. less

Agent Kirsten Wren has her fair share of demons to deal with—and some are literal.  Despite discovering the world beyond death is more complicated than simple ghosts, she’s almost got her life in order. Her effort to adopt Evan appears to be on track, no one’s tried to kill her for a whole week, and most unbelievable of all, a billionaire is in love with her.  Kirsten’s bleak childhood has left her with great contempt for the wealthy and a deep mental scar that makes intimacy terrifying... moreAgent Kirsten Wren has her fair share of demons to deal with—and some are literal.  Despite discovering the world beyond death is more complicated than simple ghosts, she’s almost got her life in order. Her effort to adopt Evan appears to be on track, no one’s tried to kill her for a whole week, and most unbelievable of all, a billionaire is in love with her.  Kirsten’s bleak childhood has left her with great contempt for the wealthy and a deep mental scar that makes intimacy terrifying. Konstantin’s high-society world is not for her, but thoughts of leaving him make her physically ill. A series of murders with ritualistic overtones leads her to suspect someone’s using paranormal means to destabilize the nation. Stuck between her tortured past, an even scarier future, and a government doubting her stories of the Abyss, she has a mere week to find the killer before all hell breaks loose. However, the demons are far closer than she expects. less

Agent Kirsten Wren thought she'd seen the true face of evil on the Moon, but the demon Avarazel didn't prepare her for an even more insidious enemy―politics.After a month to recover, Kirsten returns to active duty with a heavy heart, already missing having all day to spend with her adopted son. Reeling from her disastrous last attempt at a relationship, she takes things slow with Sam, unsure if she's even capable of welcoming a man into her life... moreAgent Kirsten Wren thought she'd seen the true face of evil on the Moon, but the demon Avarazel didn't prepare her for an even more insidious enemy―politics.After a month to recover, Kirsten returns to active duty with a heavy heart, already missing having all day to spend with her adopted son. Reeling from her disastrous last attempt at a relationship, she takes things slow with Sam, unsure if she's even capable of welcoming a man into her life.The influential Senator Preston Winchester catches her off guard, requesting her by name to dispel a haunting at his earthbound vacation home. A subsequent string of escalating spectral assaults on seemingly random, unrelated people strikes her as too coincidental, and when the angry spirit attacks her son, Kirsten suspects she is the spirit's true target.Her investigation leads her to doubt Winchester is as squeaky clean as he appears. She is determined to bring him down, but following her moral compass threatens her guardianship of Evan, as well as the very existence of Division 0. less