Addie Bryant is haunted by her past of heartbreak and betrayal. After her beau, Isaac Hanson, left the Yukon, she made a vow to wait for him. When she's sold to a brothel owner after the death of her father, Addie manages to escape with the hope that she can forever hide her past and the belief that she will never have the future she's always dreamed of. Years later, Addie has found peace in her new life as a photographer, training Camera Girls to operate and sell the Brownie camera. But during the Alaska-Yukon-Pacific Expo in Seattle, Addie is reunited with Isaac.

Larkspur Nielsen is ready for a change. Her parents have passed on, and her older brother is successfully running the family business. She bristles at the small-mindedness that permeates life in her small Ohio community, and she sees little chance of a satisfying future there. She has a little money saved, and after turning the tables on a crooked gambler who had fleeced several locals, including her younger brother, she can stake a new start for herself and her three sisters. 

In 1869, Gloriana Womack's family is much smaller since smallpox killed her mother and two of her siblings. She lives in a modest cottage in Duluth, Minnesota, with her father and young brother, and she has dedicated her life to holding her tiny, fractured family together - especially as her father is frequently gone on long fishing trips. Their livelihood may come from the waters of Lake Superior, but storms on the lake can be dangerous, even to those who know it well. Luke Carson has come to Duluth to help shepherd the arrival of the railroad to the city's port.

Richard Brockwell, the younger son of Ivy Hill's most prominent family, hasn't been home for Christmas in years. He prefers to live in the London townhouse, far away from Brockwell Court, the old family secret that haunts him, and the shadows of his past mistakes. But then his mother threatens to stop funding his carefree life - unless he comes home for Christmas. Out of options, he sets out for Ivy Hill, planning to be back on a coach bound for London and his unencumbered bachelor life as soon as the festivities are over.  

As a former smokejumper, arson investigator Bri Tucker knows her way around fires. But after a mysterious blaze takes the life of a former colleague, Bri inherits a curious puzzle from him that raises questions about several fiery deaths. Someone, however, doesn’t want her picking up where he left off in search of answers. When she teams up with ATF Special Agent Marc Davis to solve the puzzle, the case heats up—as does the attraction between them.