Mister St. James by Nina Brown

Aiden St. James never loses control. As CEO, he’s calm, composed, and untouchably professional. His suits are perfect. His voice never rises. His emotions stay locked behind ice-cold discipline.

Everyone believes he’s unshakable. Except Caterina Vaquer. As his bold, sharp-tongued executive assistant, Cat has made it her personal mission to crack his composure, just once.

Push the button.Watch him break.
But Aiden has a secret he’s been keeping tied up tight.
Then Cat finds the black box waiting on her desk. Inside: Silk ropes. A leather-bound manual. And a note written in Aiden’s precise hand…with her name on it.
Because Aiden St. James doesn’t lose control. He ties it.
What starts as a dangerous game between boss and assistant quickly becomes something deeper, every knot pulling them closer together. More forbidden. More addictive.
But someone is watching.
And when anonymous threats begin to appear, the risk isn’t just their careers. It’s Cat.
Now Aiden must decide if he can keep his professional walls intact…or use every tool in his arsenal to protect her, and bind them together for good.

Perfect for readers who love grumpy bosses, bold heroines, forbidden workplace romance, rope play tension, and a hero who will burn the world to protect what’s his.