When her mother, the Persian king’s famous senior scribe, is kidnapped, Jemmah and her sister must sneak undetected into enemy territory to rescue her. But infiltrating their adversary’s lands proves easier than escaping them. Fleeing through dangerous mountain passes, their survival depends on the skills of a stranger they free from prison: a mysterious prince named Asher. Asher is not who the world believes he is. Despite his royal blood, he has had to climb his way out of poverty. A manufacturer of some of the best weaponry in the East, Asher has only one goal: to destroy his father.

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.

When their father's death leaves them impoverished, Sarah Summers and her genteel sisters fear they will be forced to sell the house and separate to earn livelihoods as governesses or companions. Determined to stay together, Sarah convinces them to open their seaside home to guests to make ends meet and provide for their ailing mother. Instead of the elderly invalids they expect to receive, however, they find themselves hosting eligible gentlemen. Sarah is soon torn between a growing attraction to a mysterious Scottish widower and duty to her family.

When the Germans march into Denmark, Baron Henrik Ahlefeldt exchanges his nobility for anonymity, assuming a new identity so he can secretly row messages for the Danish Resistance across the waters to Sweden. American physicist Dr. Else Jensen refuses to leave Copenhagen and abandon her research-her life's dream. While printing resistance newspapers, she hears stories of the movement's legendary Havmand-the merman-and wonders if the mysterious and silent shipyard worker living in the same boardinghouse has something to hide. 

Mary Bloomfield has no illusions. Her chances for matrimony have long since passed. Still, her circumstances are pleasant enough, especially now that she has found purpose in assisting her father with his medical practice in England's beautiful Lake District. Even without love, it's a peaceful life. That is until Adam Edgerton returns to the sleepy district. This decorated war hero did not arrive home to acclaim and rest, but to a new battle against the repercussions of an insidious disease.