The Brothers Hawthorne (The Inheritance Games, 4) by Jennifer Lynn Barnes

Grayson and Jameson Hawthorne find themselves on separate paths of danger and intrigue. Grayson is tasked with protecting his half-sisters, while Jameson is drawn into a high-stakes gambling world. As the brothers navigate their own challenges, they must also confront the lingering shadows of their past and the complex legacy of their grandfather, Tobias Hawthorne.