When rumors reach Vienna that an attack by the Ottoman army is imminent, Wilhelm von Schor, one of the emperor’s courtiers, prepares to evacuate his family—including his sister, Katja. But Katja’s reluctance to leave the city and the people she loves so well grows the farther the family carriage gets from her childhood home. When she learns that another brother, Xavier, is returning to Vienna with his musketeers, she decides to remain behind and face the shadow of war. But all too soon, the Ottomans encircle the city, blanketing its inhabitants in fear. 

Czech soldier Filip Sedlák never wanted to fight for the Austro-Hungarian Empire. So at the first opportunity, he defected to the Russians. Now he and others like him have formed the Czechoslovak Legion. Their goal: leave the chaos of Russia, sail to France, and help the Allies defeat the Central Powers, thereby toppling a hated empire and winning an independent Czechoslovakia.

Despite living at her father’s inn her entire life, Elizabeth Doyle has always managed to avoid involvement with the smugglers who frequently gather there. Until now. When a handsome smuggler is brought to her with dire injuries, Elizabeth risks everything to hide him - completely unaware that the wounded man is not who he appears to be. When an opportunity arises to infiltrate the notorious smuggling gang he believes caused his father’s death, Jonas Ainsworth, the Viscount Langton, pretends to be one of them.

Left with an estate on the brink of bankruptcy after their father's death, Lady Marigold Fairfax and her brother open a private investigation firm marketed to the elite . . . to spy on the elite. Dubbed The Imposters, Ltd., their anonymous group soon becomes the go-to for the crème of society when they want answers delivered surreptitiously. But the many secrets Marigold learns about her peers pale in comparison to her shock when she and her brother are hired to investigate her best friend's father as a potential traitor.

Bastien Ley, working in Italy for the Office of Strategic Services, has been tasked with sabotaging German convoys. When his team kills an officer headed for Rome, the man’s similarity to Bastien is undeniable, and seeing an opportunity to turn the tide of the war, Bastien makes a bold decision: he will assume the dead officer’s identity. To help with his stressful assignment, his superiors send him a reinforcement in the form of the lovely Gracie Begni, an intelligent and eager radio operator with absolutely no undercover experience.