Soul Gatherer Series by Annette McCleave

Serving a five-hundred-year sentence as a Soul Gatherer-one who battles demons for the souls of the dead-Lachlan MacGregor keeps his distance from humans. That is, until the lovely Rachel Lewis knocks on his door, begging for help. As they struggle to rescue her daughter from the clutches of a powerful demon, Lachlan finds himself increasingly drawn to the artistic single mother. But when Death assigns him an unbearable task, he's left wondering who will provide more for his soul.

Death's warriors guard against demon soul thieves for one chance at redemption...Desire be damned. Bound together by burning desire and a similar darkness in their hearts, Soul Gatherers Brian Webster and Lena Sharpe race against time to take back from a demon ancient coins that could destroy civilization. But as the truth behind a deadly bargain Lena made surfaces, Brian is faced with a desperate choice-save the one, or save the many.

Sent to Japan to investigate a mystical weapon that can destroy demons, Soul Gatherer Jamie Murdoch must control his rage in a society that values tranquility and self-control. Kiyoko Ashida dedicated her life to fighting evil. Now she's dying, her remaining days linked to a mysterious artifact. But when the malicious ambitions of a fallen angel target the artifact, Jamie is torn between fulfilling his duty and saving the life of the woman he has grown to love.