Scorcher

Orphaned by the accidental use of her pyrokinetic abilities at the age of 11, Aidan O'Donnell had nowhere to turn when the secret criminal organization known as Iris took her in and used her powers of fire manipulation for their own nefarious purposes. Hoping to one day break free of Iris's hold, Aidan closely guards the secret of her criminal life as she struggles to maintain a separate identity as Aidan Grey. Aidan can't let her guard down, especially not with New York City Detective Marty Knox, the man who won't turn his back on her and the man she can't resist. But Marty has a secret of his own, one that would endanger both their lives if discovered by Iris.
Scorcher is the first book in the Forces of Nature Trilogy.