Greywaren

Greywaren, the third book in the Dreamer Trilogy by Maggie Stiefvater, centers on the Lynch family—Declan, Matthew, and Ronan—who possess the power to make and break worlds through dreams. The world was not made for a family with such power, and as the apocalypse looms, the brothers must confront the illusions and truths of their messed-up relationships and magical abilities. While Ronan is the titular Greywaren and dreamer, the final book focuses heavily on Declan, his backstory with his father Niall, and his attempts to keep his family safe amidst chaos, including tangling with the mafia and making world-solving plans with Farooq-Lane.