Dropping Like Flies by H.L Day

Quickest way to catch a killer? Bring the victim back and ask who did it. Only, nothing’s that easy.
When the bodies of young gay men start piling up in London, DCI Ben Weaver would do anything to bring the massacre to an end. Well, almost anything. He didn’t have the powers-that-be recruiting a necromancer on his bingo card. Or who that necromancer would turn out to be.
Griffin doesn’t want to work for CID, but then he has little interest in most things these days unless it involves getting drunk. Especially if it brings Ben back into his life. Ben might be his fated mate, but Griffin refuses to dance to fate’s tune. Not when guilt still gnaws away at him.
Stopping Satanic Romeo from claiming any more victims requires teamwork. But as they try to navigate their feelings and work out the killer’s endgame, he might already have them in his sights.
Who’s hunting who?