In Case I Go Missing by Swann, R. N.

A Good Girl's Guide to Murder meets Fargo in this fast-paced YA mystery about a teen detective gone missing and her best friend who must finish her investigation.

Seventeen-year-old Fenny Allen has been Sarah Vincenty's sidekick for as long as she can remember. Over the years, Sarah has built a reputation in their small town as an amateur detective and a vigilante who has dispensed her own form of justice.

Now Sarah is missing. The police have written her off as yet another teen runaway, but Fenny is convinced there's foul play. And when she discovers a binder Sarah left behind, entitled In Case I Go Missing, Fenny realizes that Sarah disappeared while investigating her biggest case yet.

With Sarah gone, it's up to Fenny and her other best friend, Sam, to finish her investigation. As they piece together the clues, they find themselves up against a decades-old mystery that links to the town's dark history. But is this binder a guide to finding Sarah--or are Fenny and Sam already too late?

The more the pair uncover, the clearer it becomes that those involved will go to great lengths to keep their secrets. And when everyone has something to hide, there are more than a few reasons to want Fenny and Sam out of the picture. Permanently.

Author: R. N. Swann
Publisher: Viking Books for Young Readers
Published: 05/26/2026
Pages: 400
Binding Type: Hardcover
Weight: 1.01lbs
Size: 8.36h x 5.52w x 1.51d
ISBN: 9780593695333
Age Range: 12-UP

Review Citation(s):
School Library Journal 03/20/2026 pg. 1
Kirkus Reviews 03/15/2026
Bulletin of Ctr for Child Bks 05/01/2026
Booklist 05/01/2026

About the Author
R. N. Swann graduated from the University of Iowa and is currently living in Baltimore with her two cats, Havoc and Toast. When she isn't writing, she works in communications, listens to podcasts, and enjoys adding to her increasingly large collection of flavored tea.