Despair by Lana Pecherczyk

Do villains deserve their happy ever after?
Daisy Lazarus is the genetically modified warrior of the forgotten deadly sin despair. After spending most of her life as the villain, she has finally been brought back into the fold and wants nothing more than to fit in, to find herself, and to prove she was worth saving. But the more she tries to be like her heroic siblings, the more her fears try to pull her back into the darkness.
Firefighter Axel Alvares has done bad things, including being one of the Syndicate’s fanatical thugs for hire. But after refusing to turn a blind eye to Daisy’s torture, he learns the right reasons sometimes have devastating consequences. He’s pulled into the midst of a deadly battle to save the world, to the center of despair, and to the woman who sits at the heart of it…
As the mad leader of the Syndicate diverts from his original plan, kicking up chaos no one saw coming, family bonds will be tested, personal growth may be for nothing and love may not conquer all…