Gallow and Ragged, book 1: Trailer Park Fae
Lilith Saintcrow2015

Jeremy Gallow is just another construction worker, and that's the way he likes it. He's left his past behind, but some things cannot be erased. Like the tattoos on his arms that transform into a weapon, or that he was once closer to the Queen of Summer than any half-human should be. Now the half-sidhe all in Summer once feared is dragged back into the world of enchantment, danger, and fickle fae—by a woman who looks uncannily like his dead wife. Her name is Robin, and her secrets are more than enough to get them both killed. A plague has come, the fullborn-fae are dying, and the dark answer to Summer's Court is breaking loose.