J.A. Jance is an American author of mystery and horror novels. She writes at least three series of novels, centering on retired Seattle Police Department officer J. P. Beaumont, Arizona county sheriff Joanna Brady, and Ali Reynolds. At signings, Jance asks bookstores to donate a percentage of their earnings from her appearances to various causes. Over the past 10 years, she has raised more than $250,000 for charity.