There are 3 books in the Chronos Origins series. The newest book is Bell, Book, and Key which came out in 2021.

1
Now, Then, and Everywhen

Book cover of Now, Then, and Everywhen
From the bestselling author of the Chronos series comes a page-turning novel of time travel, fast-paced action, and history-changing events.

When two time-traveling historians cross paths during one of the most tumultuous decades of the twentieth century, history goes helter-skelter. But which one broke the timeline?

In 2136 Madison Grace…
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2
Red, White, and the Blues

Book cover of Red, White, and the Blues
The United States' past is hijacked in a time-warping adventure of future interdimensional, high-risk games by the bestselling author of the CHRONOS series.

History is turned inside out when off-world travelers challenge Tyson Reyes and Madi Grace to a real-life game of Temporal Dilemma. Three rounds from the opponents and…

3
Bell, Book, and Key

Book cover of Bell, Book, and Key
With a madman in control of the timeline, one wrong move could be the last for time travelers intent on stopping him in this mind-bending novel by the bestselling author of the CHRONOS series.

CHRONOS historians Madi, Tyson, and Katherine and their cohorts are on the enemy's trail, fixing the…