A Riddle in Ruby

Name: A Riddle in Ruby
Price: 6.99 USD
Availability: InStock
Rating: 4.2 (46 reviews)
Author: Davis, Kent

by Davis, Kent

Fantasy Young Adult

4.2 (46)

205 pages~3.4 hr readPublished by Greenwillow Books

$6.99Near peak price

Last checked: May 12, 2026

Hidden GemHighly rated but flying under the radar. Fewer readers have found this one yet.

Price history: $0.50 – $7.59

While not the biggest discount we've seen for this book, it's still a great deal and we recommend grabbing it before price returns to its normal range.

Price range: $0.50 – $7.59

Buy on Amazon - $6.99

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Fans of these authors will like this...

Jonathan Stroud
Diana Wynne Jones
Terry Pratchett

Fans of these books will like this...

The Amulet of Samarkand
Howl's Moving Castle
Septimus Heap: Magyk

Perfect for you if...

You love witty, fast-paced adventures with clever protagonists who don't take themselves too seriously.
You're after middle grade fantasy that treats young readers as smart, with layered plots and characters who actually surprise you.
You enjoyed Jonathan Stroud or Septimus Heap and want more of that particular blend of humour, mystery, and inventive world-building.

Maybe not for you if...

You prefer straightforward narratives without intricate plotting or multiple threads weaving together.
You're looking for high-stakes emotional drama or darker fantasy themes—this skews lighter and more adventure-focused.
You want a standalone story rather than investing in a trilogy.

About this book

Ruby Teach is a thief-in-training and keeper of secrets, including ones unknown even to herself. Daughter of a smuggler and pirate, she has spent her life learning to swindle, steal, and pick complex locks. When she collides with aristocratic young lord Athen, her world spirals into chaos as she discovers she has been hiding from secret societies and the Royal Navy—both now pursuing her. This first book in a fantasy-adventure trilogy is set in an alternate colonial Philadelphia where alchemy, a blend of magic and science, powered the industrial revolution. The story features fully rounded characters and rapid-fire, funny dialogue as Ruby navigates her new circumstances.

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We track price drops, sale patterns, and predict when this book will go on offer next.

Price History

Kindle price over time. Green zones = periods when the book was free.

$0.50 – $7.59

Price has dropped 19 times over the last 2 years. Goes on sale roughly every 39 days. Typically stays discounted for 35 days.

Sales Rank

Amazon sales rank: lower number = better selling book. #1 is the bestseller.

Currently around #2,355K in the Kindle store — a niche title. Climbing the charts — 27% improvement recently.

Rating & Reviews

Purple line = star rating over time. Blue area = total review count growth.

Currently 4.2★ from 46 reviews

Review activity has been quiet recently. Rating has remained stable at 4.2 over the tracking period.

Sale Prediction

Actual Predicted

Based on past patterns, a price drop could happen soon. It typically goes on sale every 39 days and the last drop was 106 days ago. Typical discount: 93% off.

Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.

Curious how prices and deals move across the whole Kindle store? See the latest findings in The Kindle Report