Thunder and Mercy by Barr, Jennifer Robin
Thunder and Mercy by Barr, Jennifer Robin

Thunder and Mercy

"A dazzling plot with characters who are rich and real and unforgettable."--Lynda Mullaly Hunt, New York Times...
$22.78 USD
$22.78 USD
Please hurry! Only 357 left in stock
Author: Jennifer Robin Barr
Format: Hardcover
Language: English
Subtotal: $22.78
Thunder and Mercy by Barr, Jennifer Robin

Thunder and Mercy

$22.78
Thunder and Mercy by Barr, Jennifer Robin

Thunder and Mercy

$22.78
Author: Jennifer Robin Barr
Format: Hardcover
Language: English
Description
"A dazzling plot with characters who are rich and real and unforgettable."--Lynda Mullaly Hunt, New York Times best-selling author of Fish in a Tree

★ School Library Journal, starred review

Is a hidden diary the key to an unsolved secret from the American Revolution?

It's 1979 and twelve-year-old Theodora "Thunder" Underwood is dreading her summer vacation once again. Every year, her scientist parents disappear on far-flung scientific expeditions, leaving her with relatives who clearly don't want her around.

But this summer, Thunder is sent to Mount Pleasant, her aunt's historic yet crumbling old mansion outside of Philadelphia once owned by Revolutionary War traitor Benedict Arnold. When Thunder discovers a mysterious diary written by Mercy, a girl her age who lived through the American Revolution, Thunder is plunged into a mystery that involves a shadowy prowler, a hidden ring, and mysterious spies--making her summer far more exciting than she ever expected.

Fast-paced and full of twists, this suspenseful middle grade novel transports young readers between the 1770s and 1970s as Thunder uncovers the truth behind a Revolutionary-era spy network--and discovers the importance of friendship, family, and her own voice along the way.

Author: Jennifer Robin Barr
Publisher: Calkins Creek Books
Published: 07/14/2026
Pages: 368
Binding Type: Hardcover
Weight: 1.00lbs
Size: 8.44h x 5.79w x 1.28d
ISBN: 9781635923261
Audience: Ages 9-12


Review Citation(s):
School Library Journal 05/01/2026 pg. 70
Kirkus Reviews 06/15/2026

About the Author
Jennifer Robin Barr grew up in the Philadelphia area during the 1970s and '80s, spending her summers immersed in imaginative play with neighborhood friends, whether diving into games like home free or acting out scenes from Charlie's Angels. Her writing focuses on weaving fictional stories around historical events, especially those lesser-known stories from Philadelphia's past. She finds inspiration in the city's historic neighborhoods and old cemeteries. Jennifer's debut novel, Goodbye, Mr. Spalding, was named a 2019 Booklist Top 10 Sports Book for Youth. Visit her at jenniferrobinbarr.com.
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