Flight of Magpies - A Charm of Magpies, #3

Danger in the air. Lovers on the brink. With the justiciary understaffed, a series of horrifying occult murders to be investigated, and a young student flying off the rails, magical law enforcer Stephen Day is under increasing stress. And the strain is starting to show in his relationship with his aristocratic lover, Lord Crane. Crane chafes at the restrictions of England's laws, and there's a worrying development in the blood-and-sex bond he shares with Stephen.
A development that makes a sensible man question if they should be together at all. Then a devastating loss brings the people he most loves into bitter conflict. Old enemies, new enemies, and unexpected enemies are painting Stephen and Crane into a corner, and the pressure threatens to tear them apart...