Frances Wynn, the American-born Countess of Harleigh, enjoys more freedom as a widow than she did as a wife. After an obligatory year spent mourning her philandering husband, Reggie, she puts aside her drab black gowns, leaving the countryside and her money-grubbing in-laws behind. With her young daughter in tow, Frances rents a home in Belgravia and prepares to welcome her sister, Lily, arriving from New York - for her first London season.

Rough-around-the-edges Harriet Morrow has long been drawn to the idea of whizzing around the city on her bicycle as a professional detective, solving crimes for a living without having to take a husband. She seizes the chance when the prestigious Prescott Agency hires her as its first woman operative. The move sparks controversy—with skeptical male colleagues, a high-strung office secretary, and her boss, Mr. Theodore Prescott, all waiting for her to unravel under the pressure.

Philadelphia, 1921. When Edie Shippen returns home after spending years in California recovering from Influenza, she's shocked to discover that her childhood sweetheart is engaged to her twin sister. Heartbroken and adrift, Edie vows to begin living her life as a modern woman—and to hell with anyone who gets in her way. But as young women start to disappear from the city, her newfound independence begins to feel dangerous.

Amelia Amesbury—widow, mother, and countess—has a secret. Amelia writes for a London penny paper, doling out advice on fashion, relationships, and manners under the pen name Lady Agony. But when a lady’s maid writes Amelia to ask for advice when she believes her mistress has been murdered—and then ends up a victim herself—Amelia is determined to solve the case.

London, 1923. Newly minted research assistant Saffron Everleigh is the first woman to hold the position at University College of London. When she attends a dinner party for the school, she expects to engage in conversations about the university's large expedition to the Amazon. What she doesn’t expect is for Mrs. Henry, one of the professors’ wives, to drop to the floor, poisoned by an unknown toxin. Dr. Maxwell, Saffron’s mentor, is the main suspect, and evidence quickly mounts.

Hours later, the man’s cold body lies in the city mortuary, alongside the woman he couldn’t save. And his sister, unconventional nurse Gemma Tate, tracks down troubled police inspector Sebastian Bell to unravel the truth. Sebastian has enough pressure to solve the murder of an aristocratic heiress without Gemma meddling in his case. But the cryptic sentences she brings him from her brother’s notebook could be a crucial lead. If only they knew what “milky way” meant.

London, 1861. Samantha Kingston has lived under the control of her overbearing uncle since the death of her parents six years ago. Trapped by the conventions of her gender and social class, she is desperate to find a way out. But when her aunt and uncle are murdered, the freedom she sought seems even further out of reach. A suspect in the crime, she finds herself on the run, unsure whom to trust, lost in the underworld she had only ever read about in the pages of a Dickens novel.

England, 1919. Verity Kent's grief over the loss of her husband pierces anew when she receives a cryptic letter suggesting her beloved Sidney may have committed treason before his untimely death. Determined to dull her pain with revelry, Verity's first impulse is to dismiss the derogatory claim. But the mystery sender knows too much - including the fact that during the war Verity worked for the Secret Service, something not even Sidney knew.

Olive Belgrave needs a job. Despite her aristocratic upbringing, she’s penniless. Determined to support herself, she jumps at an unconventional job—looking into the background of her cousin’s fiancé, Alfred. Alfred burst into the world of London’s high society, but his answers to questions about his past are decidedly vague. Before Olive can gather more than the basics, a murder occurs at a posh party. Suddenly, every Bright Young Person in attendance is a suspect, and Olive must race to find the culprit because a sly murderer is determined to make sure Olive’s first case is her last.

London, 1921: Mabel Canning is proud to be a modern woman working for the Useful Women’s Agency, carrying out tasks for gentlewomen from flower arranging to washing muddy dogs. But when she answers the door for wealthy widow Rosalind Despard, she almost chokes on her cucumber sandwich when she finds a soldier’s body on the doorstep. As she offers tea to the policemen of Scotland Yard, Mabel can’t resist getting drawn into the investigation.

Philadelphia, 1921. When Edie Shippen returns home after spending years in California recovering from Influenza, she's shocked to discover that her childhood sweetheart is engaged to her twin sister. Heartbroken and adrift, Edie vows to begin living her life as a modern woman—and to hell with anyone who gets in her way. But as young women start to disappear from the city, her newfound independence begins to feel dangerous.

Lady Augusta Colebrook, “Gus,” is determinedly unmarried, bored by society life, and tired of being dismissed at the age of forty-two. She and her twin sister, Julia, who is grieving her dead betrothed, need a distraction. One soon presents itself: to rescue their friend’s goddaughter, Caroline, from her violent husband. The sisters set out to Caroline’s country estate with a plan, but their carriage is accosted by a highwayman. In the scuffle, Gus accidentally shoots and injures the ruffian, only to discover he is Lord Evan Belford, an acquaintance from their past.

Dash, a reporter in Monterey, California, is desperate to outrun his past. During the day, he investigates the reemergence of a long-dormant serial killer. At night, he has become entangled with a criminal cult that promises a pill to erase his traumatic memory. But as Dash begins to lose his memories—and his sense of self—he discovers a dark secret about the cult, one that would horrify its members. And soon he finds himself in a race against time to evade the cult, unveil the killer, and reconcile his past before his own memories fade away ...

Since the weekend of the party—the one twenty-two-year-old Liv can’t remember, the one that left her covered in bruises—she’s been locked out of her bedroom by a padlock. Her parents are behaving oddly and her best friend won’t respond to her texts. Maybe she really was out of control that night? Meanwhile Liv’s father, Janus, is not sure he can do what is necessary to keep this secret hidden. He brought his family from Australia to Los Angeles to chase his dream of seeing his novel on the big screen, and he can’t let them down. Not again.

Rafi Dubois is five years old when his mother is murdered after the Battle of Crecy in 1346. Alone and lost, Rafi is given a token by the dying Englishman who tried to save his mother’s life: a half-broken family seal which he urges Rafi to return one day to Winchester. Years later, when Rafi saves a wealthy merchant’s wife from a brutal robbery, he is rewarded with the chance to travel to England, taking the seal with him.