Play of Passion (Psy-Changling, #9) by Nalini Singh

In his position as Tracker for the SnowDancer pack, Drew Kincaid must rein in rogue changelings who’ve lost control of their animal halves- even if it means killing those who’ve gone too far. But nothing in his life has prepared him for the battle he must now wage-to win the heart of a woman who makes his body ignite…and who threatens to enslave his wolf.