To Free the Stars by J’nell Ciesielski

This white-knuckled conclusion to The Brilliance of Stars takes readers on a breathless adventure from the speakeasies of America to the Horse Guards Parade in London, an ancient cemetery outside Paris, and back to the Eastern European strongholds where the Vales’ tragedy first began.

Ten years have passed since Jack and Ivy, elite operatives for the secret agency Talon, rescued their friend Philip and completed their fateful mission. The 1920s are in full swing as American speakeasies thrive amid Prohibition, and despite the team’s best efforts, the deadly cult, the Order of the Rising Moon, lives on in the shadows. Which is no surprise to Ivy; nothing has gone as she expected since that day after Poenari Castle.
When a wave of assassinations strikes world leaders, intel confirms the Order’s involvement. Ivy holds them responsible for the tragedy that changed her life, and she is determined to find and destroy the villains once and for all—but she must do so before their relentless assassin eliminates his next target. Her.
Except, there’s something oddly familiar about the way he moves, the way he anticipates each of her moves. It’s as if he knows her. But that’s not possible. Is it? Ivy will have to rely on every skill she’s learned if she hopes to survive—and save those she loves. No matter the cost.

Bestselling author J’nell Ciesielski wraps up the Jack and Ivy novels with yet another thrilling adventure filled with glamorous espionage and a boundless romance.