Never Search His Coatroom. Nightlock Sins, #21

The most dangerous rooms are the ones you're invited into. The ones where the light is warm and the lock is quiet and the man who built it all says, Stay. Investigative journalist Clea Sutton has spent five months looking for her missing best friend. Her only lead points to the Fen Diplomatic Club, an exclusive, highly surveilled playground for the global elite. Going undercover as a coat-check attendant, Clea plans to find the evidence she needs and get out.
But she searches the wrong coat. Caught red-handed with her friend's passport by the club's enigmatic and controlling owner, Nikolai Fen, Clea expects the worst. Instead, she is offered a deal. Nikolai is methodically dismantling his late father's human trafficking network from the inside, and he needs a civilian witness to bring down the network's untouchable leader. The price for the truth? Twenty-one days.
For three weeks, Clea must live in Nikolai's curated fortress and pose as his intimate companion. It's a dangerous game of cat-and-mouse played in ballrooms and hidden passages. Nikolai controls the locks, the cameras, and the rules. He is cold, calculating, and unapologetically obsessive. Yet, as Clea maps the building's secrets and decodes the scarred man who runs it, she realizes the greatest threat isn't the criminal empire they are trying to destroy.
It's the realization that she might not want to leave her beautiful cage.