The Beast of Ashwood Manor by Jordan Lee

When Cale Dawkins left town to visit his mother for Spring Tide, he never imagined the bypath to Ashwood’s abandoned manor would lead him to another realm altogether.
Trapped in a world inhabited by monsters, Cale quickly learns that he must stay within the manor grounds with the servants who live there or succumb to Ashwood’s darkness.
But little does he know that one of Ashwood’s most feared beasts is living under the same roof with him as the dark, brooding lord of the manor, and it just so happens that the key to breaking the curse lies in winning this lord’s heart over. Eager to save them all, Cale must decide if he’s ready to reap the consequences of love or death.