Trapped in a world of heteronormative expectations, queer Marquis Emil longs for independence. So, when his aunt declares that he must marry to produce an heir, or else he will be disinherited, he flees, disguising himself as a servant, intending to hide until he comes of age and then reclaim his inheritance.
All Emil needs to do is keep a low profile and wait, but soon he encounters a mystery that goes far beyond his imagination. Serving under the fearsome Count Montoni, Emil learns that every full moon, the count and his family suffer from a strange ailment that requires them to be submerged in complete tranquility. On the night of the full moon, amidst such visual family quarrels, Emil discovers a mutilated body on the grounds and immediately reports it. But he has no idea what measures Count Montoni is willing to take to protect his family secrets.
As Emil delves deeper into the affairs of this household and becomes entangled in supernatural events, his inquiries attract the attention of the handsome doctor Bram and the charming nephew of the count, Henry.
But how does one earn the trust and affection of Bram without revealing his true identity and hidden desires? And how can one trust, let alone love, Henry—a man as fickle as the ever-changing moon? To find the love he deserves and survive among the Montoni family, Emil will have to risk not only his title but also his very life.