In the world of the series, many people and events considered fictional are historical, and vice versa; the action of each book in the series weaves in and out of the events of a famous work of literature. For example, in the first book in the series, time travelers contesting the fate of Richard I of England become caught up in Walter Scott's Ivanhoe.
In the world of the series, many characters and occurrences deemed fictional are actually historical, and vice versa; each book in the series interweaves its events with those from a renowned literary work. For instance, in the first book, time travelers battling Richard I of England's destiny become entangled in Walter Scott's Ivanhoe.