Eli Kennebrae plans to revolutionize cargo transportation on the Great Lakes. But his grandfather's meddling obligates him to an arranged engagement. Though Josie Zahn is kindhearted and strikes his interest, Eli needs an engineer for his ship, not a fiancée. Josie has admired Eli for years, but to him, she’s just “one of the Zahn girls.” Worse, society expects her to marry, not pursue her passion for mathematics and engineering. If she could only get Eli’s attention, she could help him achieve his goals.

In 1875 California, Brody MacKenzie arrives at the Two Harts Ranch on a mission to find his runaway brothers, worried they may have fallen into harm. Instead, he discovers them thriving at the ranch's school and orphanage under the care of Ellie Hart, a woman with a heart as resilient as the land she calls home. His options limited, Brody reluctantly takes on the role of ranch doctor, and he forms an unexpected bond with Ellie, who's kept a steady eye on Brody's two rapscallion brothers.

Once known among New York's elite as the American Adonis, Everett Griffin now lives as a recluse in the wilds of Texas. The treachery of a former admirer left his face and his spirit riddled with scars, so he hides himself away, his only companions a trio of trusted servants and an oversized dog. Locals whisper of the beastly man who lives in the gloomy manor outside of town and his tendency to attack anyone who dares approach. Everett relishes his fearsome reputation and uses it as a shield to guard his privacy.

After five years of tracking and capturing spies on English soil, Philip Jonquil, Earl of Lampton, is in pursuit of his last quarry. But at a traveler’s inn, he encounters an unexpected and far more maddening foe: Sorrel Kendrick, a young lady who is strikingly pretty, shockingly outspoken, and entirely unimpressed with him. Indeed, Sorrel cannot believe the nerve of this gentleman, who rudely accuses her of theft and insults her feminine dignity. Doubly annoyed when they both end up at a party hosted by mutual friends, Philip and Sorrel privately declare war on one another.

Julia Cummings has long been acquainted with loss - her mother, her brother, her sister, her friend, all gone too soon. But the loss that pushed her grief to the limit as a young girl was that of her best friend, Lucas Jonquil, who abandoned her without looking back. Now, eight years later, Lucas has returned to Lampton Park, and Julia has steeled herself - she will never forgive the man who broke her heart.