Invasive species, mysterious creatures, and a high-stakes rescue on Gilded Age Florida's inner waterways bring this stunning trilogy to an explosive conclusion!

Frankie Davenport; her sister, Lulu; and their best friend, Algie Emsworth, are eager for their next adventure. When they see an ad in the local paper for a river cruise and hear rumors of a monster in that very same river, they know that this is just the trip for them.

During an outing, the trio stumble upon a strange creature in distress. Could this be Sabrina, the fabled river monster? When an unidentifiable aquatic corpse is discovered, Professor Champion, Frankie's nemesis, is called in to investigate. Frankie, Lulu, and Algie are at odds with one another over how to save Sabrina, and Frankie must decide if she should keep doing things her way or trust her friends and family to save Sabrina.

Samantha San Miguel's Harmless is an exciting adventure brought to vivid life. This page-turning novel is a thrilling conclusion to the Spineless trilogy that's perfect for fans of Beyond the Bright Sea and Serafina and the Black Cloak.

Author: Samantha San Miguel
Binding Type: Hardcover
Publisher: Union Square Kids
Published: 09/09/2025
Series: Spineless
Pages: 304
ISBN: 9781454960614


Review Citation(s):
School Library Journal 05/01/2025 pg. 79
Booklist 07/01/2025 pg. 82
Kirkus Reviews 07/15/2025

About the Author
Samantha San Miguel grew up on the Treasure Coast of Florida. Living sandwiched between ocean and estuary gave her a wholehearted respect for wildlife, especially the kind that can eat you. She's spent countless hours scanning for sea monsters, but the only ones she's seen so far have been in her imagination. Samantha dreams of one day seeing with her own eyes the landscapes from her abuelito's stories of Cuba. She can be found online at samanthasanmiguel.com.