November Frost. The Frost Witch Saga, #2

Evil does not leave quietly. Courtney McLaren thought the nightmare was over. As winter tightens its grip on the city, Courtney realizes the frost witch left something behind-something cold, hungry, and spreading. Worse still, the evil threatens to control her ex-boyfriend. Now the people and cats Courtney has come to love are trapped in a slow descent toward ruin, and she may be the only one capable of stopping it.
To save them, she must confront the man who once knew her better than anyone before the darkness inside him consumes what remains of his humanity. But victory comes with a terrible cost. Sometimes magic changes you forever. November Frost is the haunting second installment in the Frost Witch Saga, a gothic urban fantasy filled with psychological suspense, creeping dread, found family, and magical cats.