Caroline holds a deep secret. Living in 1727 and 1927 simultaneously, each night she goes to sleep in one life and wakes up in the other. In search of answers to her unique existence, Caroline stumbles upon a letter from her mother hinting at her own experiences as a time-crosser, sending Caroline on a daring quest to uncover the truth. In 1727, Caroline disguises herself as a cabin boy and joins a ship sailing for the Bahamas, her mothers last known location, where she crosses paths with a ruthless but handsome pirate and is caught in a web of secrets, deception, and unexpected alliances.

In 1927 St. Paul, Minnesota, Caroline grapples with her other life as the daughter of a renowned preacher. Her two older brothers have fallen prey to the corruption rampant during Prohibition, and Caroline struggles to keep their involvement hidden to save her fathers career. As her search for answers about her time-crossing leads her to the dangerous yet exciting world of speakeasies, Caroline enlists the help of a childhood friend who is now a police officer. But with her familys future at risk and their loyalties tested, Caroline faces a life-altering decision that could reshape her destiny.

Grace and Hope are identical twin sisters born with the ability to time-cross together between 1692 Salem, Massachusetts, and 1912 New York City. As their twenty-fifth birthday approaches, they will have to choose one life to keep and one to leave behind forever–no matter the cost.

In 1692, they live and work in their father's tavern, where they must watch helplessly as the witch trials unfold in their village, threatening everyone. With the help of a handsome childhood friend, they search for the truth behind their mother's mysterious death, risking everything to expose a secret that could save their lives–or be their undoing.

In 1912, Hope dreams of becoming one of the first female pilots in America, and Grace works as an investigative journalist, uncovering corruption and injustice. After their parents' orphanage is threatened by an adversary, they enter a contest to complete a perilous cross-country flight under the guidance of a daring French aviator.

The sisters have already decided which timeline they will choose, but an unthinkable tragedy complicates the future they planned for themselves. As their birthday looms, how will they determine the lives–and loves–that are best for both of them?