Clean thrillers, dangerous secrets, and fast-moving suspense.
S.F. Baumgartner writes clean, page-turning suspense across conspiracy thrillers, crime thrillers, action thriller novellas, and future standalones. Whether you want a long-running estate mystery, a crime investigation, or a fast novella-sized read, there is a doorway into the catalog.
New Release
Stolen Secrets is available now.
Stolen Secrets, Book 7 in the Mirror Estate thriller series, raises the stakes with buried truths, hidden agendas, elite power players, and a conspiracy that refuses to stay buried.
Coming Soon
Black Gold Secret — The Mercer Files, Book 1. A new action thriller novella series is coming from S.F. Baumgartner. Start now with The Last Shift, the free Mercer Files reader magnet, and get ready for Black Gold Secret.
Choose your thriller path.
Start with a complete conspiracy thriller series, follow a crime thriller case, or step into the new Mercer Files action thriller novella world.
Mirror Estate Thrillers
Conspiracy Thrillers. Family secrets, hidden power, and a conspiracy that widens with every book. Start with Buried Secrets and follow Dylan Roche through the Mirror Estate, all the way to the new release, Stolen Secrets.
View Mirror Estate Books
KC & Orlando Prime
Crime Thrillers. Clean crime thrillers built around danger, investigation, and high-stakes cases. Start with Book 1, then watch for Lethal Design, Book 2, coming August 4, 2026.
View KC & Orlando Prime
The Mercer Files
Action Thriller Novellas. Fast, mission-driven suspense in novella form. Start with the free reader magnet The Last Shift, then watch for Black Gold Secret, Book 1 in the series.
Get The Last ShiftNot sure where to begin?
If you are new to S.F. Baumgartner, the Reading Order page will help you start the Mirror Estate series in order, while the Reader Hub gives you free stories, extras, and updates.
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