The Lighthouse Keeper by Liv Rancourt

Twenty years ago, a thief stole the Ferox Cor, and now he’s dead.

Vincent Fairchild, a witch with little power beyond his charm, is tasked with finding that dangerous magical object. He’s already been pruned from the family tree because “nice” people don’t possess even the lowest of magic. If he fails to return with the Ferox Cor, he’ll lose his place with the Witches’ Council.
Determined not to be cast aside again, Vincent travels to the West Point lighthouse, where he learns that the Witches’ Council was mistaken. Martin Gallagher, the thief, didn’t use the Ferox Cor to enrich himself, and his son is not a child. In fact, Rafe Gallagher might be the most powerful witch Vincent has ever met. Powerful, adult, and incredibly handsome.
Martin will return on Samhain when the veil between the worlds is the thinnest. He’s promised to reclaim the Ferox Cor, but doing so risks unleashing a great evil on the world. Rafe has sworn to destroy that powerful object, but if he succeeds, Vincent’s future is at risk. There’s a way forward, but to find it, Vincent must look to his heart.