Jameson Hawthorne, the 19-year-old third-born son of Skye Hawthorne, is one of the four Hawthorne brothers, grandsons of deceased billionaire Tobias Hawthorne. Jameson is in a relationship with Avery Kylie Grambs, the girl who inherited his grandfather’s fortune and the protagonist of the first three books in the series. Jameson is restless, always looking for more, and at the start of the novel, “the urge to remember, to think, to give in to the siren call of risk” is particularly intense (13). He loves games and puzzles, a passion he shares with Avery, and he often takes dangerous risks or makes reckless decisions. 

His biological father, Ian Johnstone-Jameson, meets him in London and tasks him with finding the Devil’s Mercy club and getting an invitation to the Game to win back Vantage, the Johnstone-Jameson family home. At first, he accepts because “doing something to keep his mind occupied always felt less dangerous than doing nothing” (25), but by the end of the novel, Jameson wins Vantage, “a family legacy that Jameson had been willing to fight for when he wasn’t even considered family” (423). Jameson lets go of his need for his grandfather or his father’s approval, finding safety and comfort in his relationship with Avery.