The Hidden Key of Brooke Sumner

Treasures of Halstead Manor #3

by Susan L. Tuttle

In the third installment of the Treasures of Halstead Manor series, Brooke Sumner carefully avoids and ignores Storm Whitlock—her replacement in Caspar's mysterious treasure-hunting group—and instead focuses on her antique shop.

Caspar's next assignment entails finding the second half of a key lodged in the spine of their most recent discovery, and Brooke reluctantly rejoins the group to keep Storm in check. But as they delve into their next adventure, she realizes that Storm might not be who she thought. While the mysterious key unlocks a vault of secrets, Brooke discovers that treasure-hunting together has unlocked her heart toward Storm and the rest of the group. With priceless artifacts at their fingertips, the team discovers that the true treasure is so much more.

The Hidden Key of Brooke Sumner combines mystery, friendship, and romance, sending the reader on an action-packed adventure around the globe in pursuit of a treasure that could fall into the wrong hands. Susan L. Tuttle spins a story with relatable characters and an engaging mystery that will keep readers turning pages late into the night.

280 pages, Paperback

Expected publication March 24, 2026

About the author

Susan L. Tuttle is a best-selling, multi-published author of small town, midwestern romances featuring ordinary people discovering extraordinary love. Her critically acclaimed novel Love You, Truly was an ACFW Carol Award finalist. As a former homeschooling mom, current pastor’s wife and women’s ministry leader at a large church, Susan loves to help women discover how their worth and identity are found in Christ, not the many roles they fill. She often shares that encouragement in her quarterly newsletter and on her Instagram page. When she’s not writing or serving her church and community, you can find her cozied up in one of her many favorite cardigans, sipping coffee, and obsessively eating cookies. She also enjoys hiking with her husband—to burn those cookie calories. Susan lives in Michigan with her family and a very spoiled Borderdoodle named Finley Frank.

Reviews

[Charity · Rating 5 out of 5]

Oh my goodness, Susan Tuttle's books just keep getting better and better! I was hooked with the first book in this series, completely invested with the second, and hanging on every word with this third one. What a perfect conclusion to the series!

[Toni Shiloh]

read for endorsement; rtc

[Ronie]

Read for endorsement ...