Every Hour until Then by Gabrielle Meyer

Gifted with the ability to time-cross between Victorian-era London and World War II Washington, DC, Kathryn faces two lives fraught with danger. In 1938 amid the looming shadow of war, Kathryn is invited to the London Museum as a guest curator to create a groundbreaking exhibit on Jack the Ripper and his reign of terror. As she delves into her grim research, she uncovers a chilling truth: Her own sister is destined to become the Ripper’s final victim decades earlier.

In 1888, in a race against fate, Kathryn is assisted by her handsome childhood friend in hunting down history’s most elusive killer. As they unravel the threads of mystery woven through time, Kathryn must decide if she’ll unmask the murderer history has chosen to hide, forfeiting a life with the man she loves to save her sister.