Lady Georgina Hawthorne has worked tirelessly to seal her place as the Incomparable for her debut season. At her first London ball, she hopes to snag the attention of an earl. With money and business connections, but without impeccable bloodlines, Colin McCrae is invited everywhere but accepted nowhere. When he first encounters the fashionable Lady Georgina, he's irritated by his attraction to a woman who concerns herself only with status and appearance.

Miss Amelia Stalwood may live in London at her absent guardian's townhouse, but she's never actually met any nobility, and instead of aristocrats, her closest friends are servants. Quite by happenstance, she's introduced to the Hawthorne family and their close family friend Anthony, the reformed marquis of Raebourne. They welcome her into their world, but just as she's beginning to gain some confidence and even suspect she may have caught Anthony's eye, she's blindsided by an unexpected twist in her situation accompanied by nasty rumors.  

Life for Lady Adelaide Bell was easier if she hid in her older sister's shadow - which worked until her sister got married. Even with the pressure of her socially ambitious mother, the last thing she expected was a marriage of convenience to save her previously spotless reputation. Lord Trent Hawthorne couldn't be happier that he is not the duke in the family. He's free to manage his small estate and take his time discovering the life he wants to lead.

Lady Miranda Hawthorne acts every inch the lady, but inside she longs to be bold and carefree. Entering her fourth Season and approaching spinsterhood in the eyes of society, she pours her innermost feelings out not in a diary but in letters to her brother's old school friend, a duke - with no intention of ever sending these private thoughts to a man she's heard stories about but never met.

Forced to run for her life, Kit FitzGilbert finds herself in the very place she swore never to return to - a London ballroom. There she encounters Graham, Lord Wharton, who believes Kit holds the key to a mystery he's trying to solve. As much as she wishes that she could tell him everything, she can't reveal the truth without endangering those she loves.

In early 1800s England, Jess Beauchene has spent most of her life in hiding and always on the move in an effort to leave her past far behind her. But when she learns the family she thought had died just might be alive and in danger, she knows her secrets can only stay buried for so long. Derek Thornbury loves the past, which has led him to become an expert in history and artifacts. He knows Jess has never liked him, but when she requests his help deciphering the clues laid out in an old family diary, he can't resist the urge to solve the puzzle. 

While Brice has never been one to shy away from manor-born ladies, the last thing he needs is the distraction of Lady Rowena, who finds herself in a desperate situation. But when Rowena's father tries to trap Brice into marrying his daughter, Brice makes a surprising decision. Rowena wanted to escape the Highlands, but she's reluctant to marry a notorious flirt. And when she learns that Brice is mixed up in questionable business with a stolen treasure, she fears she's about to end up directly in the path of everything she was trying to avoid.

To save her family from financial ruin, Miss Poppy Garrison accepts an unusual proposition to participate in the New York social season in exchange for her grandmother settling a family loan that has unexpectedly come due. Ill equipped to handle the intricacies of mingling within the New York Four Hundred, Poppy becomes embroiled in one hilarious fiasco after another, doomed to suffer a grand societal failure instead of being deemed the diamond of the first water her grandmother longs for her to become. 

Hampton Hall's new owner has the villagers of St. Hampton Heath all aflutter - all except Lavinia Ellison. The reverend's daughter cares for those who are poor and sick, and the seventh Earl of Hawkesbury definitely does not meet that criteria. His refusal to take his responsibilities seriously, or even darken the door of the church, leave her convinced he is as arrogant and reckless as his brother - his brother who stole the most important person in Lavinia's world.

Lady Ella Myerston can always find a reason to smile - even if it's just in hope that tomorrow will be better than today. All her life everyone has tried to protect her from the realities of the world, but Ella knows very well the danger that has haunted her brother and their friend, and she won't wait for it to strike again. She intends to take action, and if that happens to involve an adventurous trip to the Cotswolds, then so much the better.

Three years into the Great War, England's greatest asset is their intelligence network - field agents risking their lives to gather information, and codebreakers able to crack every German telegram. Margot De Wilde thrives in the environment of the secretive Room 40, where she spends her days deciphering intercepted messages. But when her world is turned upside down by an unexpected loss, for the first time in her life numbers aren't enough.

All of England thinks Phillip Camden a monster - a man who deliberately caused the deaths of his squadron. But as nurse Arabelle Denler watches the so-dubbed "Black Heart" every day, she sees something far different: a hurting man desperate for mercy. And when their paths twist together and he declares himself her new protector, she realizes she has her own role to play in his healing.

Lady Charlotte Featherington is destined for great things on the marriage market. After all, as the beautiful daughter of a marquess, she should have her pick of the eligible nobility when she debuts. She, however, has love at the top of her list of marriageable attributes. And her romantic heart falls hard for one particularly dashing, attentive suitor. Sadly for Charlotte, her noble father intends her betrothed to be someone far more dull. William Hartwell may be a duke, but he knows he was Charlotte's father's pick, not the young lady's own choice.

Tainted by scandal and forced to leave London for the quieter Brighton countryside, the honorable Miss Clara DeLancey is a shadow of her former society self. She's lost the man she loved to another and, in a culture that has no patience for self-pity, is struggling with depression. A chance encounter brings her a healing friendship with the sisters of an injured naval captain.  

Willa Forsythe is both a violin prodigy and top-notch thief, which makes her the perfect choice for a crucial task at the outset of World War I - to steal a cypher from a famous violinist currently in Wales. Lukas De Wilde has enjoyed the life of fame he's won - until now, when being recognized nearly gets him killed. Everyone wants the key to his father's work as a cryptologist. And Lukas fears that his mother and sister, who have vanished in the wake of the German invasion of Belgium, will pay the price. The only light he finds is meeting the intriguing Willa Forsythe.