Radiant Sin: A Darkly Hot Modern Retelling of Apollo and Cassandra (Dark Olympus Book 4)

Name: Radiant Sin: A Darkly Hot Modern Retelling of Apollo and Cassandra (Dark Olympus Book 4)
Price: 1.99 USD
Availability: InStock
Rating: 4.2 (5812 reviews)
Author: Katee Robert

by Katee Robert

Dark Romance Romantasy

4.2 (5,812)

4.2 stars from 5,812 reviews. One of the highest rated Dark Romance books we track.

$1.99KU87% off peak

Last checked: Jun 4, 2026

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Price history: $1.99 – $15.01

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Price range: $1.99 – $15.01

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Perfect for you if...

You love modern Greek mythology retellings with serious heat and real emotional stakes, not just surface-level smut.
You're invested in the Dark Olympus world and want to see how Apollo's story fits into the larger conspiracy brewing across the series.
You enjoy dark, morally grey characters who scheme and seduce whilst genuinely caring for each other.

Maybe not for you if...

You prefer slow-burn romance where the physical tension builds gradually rather than explodes early and often.
You want standalone books; this is book four in a series and assumes you know the world and its key players.
You're uncomfortable with explicit sexual content or power dynamics that skew toward dominance and control.

About this book

Cassandra Gataki, a disgraced member of a fallen house, has learned the dangers of trusting the Thirteen. When Apollo, Olympus's golden god and official spymaster, asks her to pose as his plus-one at a week-long party hosted by a dangerous new power player, she reluctantly agrees on one condition: afterward, she and her sister will be allowed to leave for good. Apollo trusts Cassandra more than anyone else in Olympus, despite what others say. As their fake relationship intensifies, a real danger emerges that threatens both of them and the heart of Olympus itself. This is a modern retelling of Apollo and Cassandra set in the Dark Olympus world.

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Price History

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

$1.99 – $15.01

Currently on sale at $1.99 — 87% off peak. Price has dropped 12 times over the last 4 years. Goes on sale roughly every 95 days. Typically stays discounted for 16 days.

Sales Rank

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

Currently around #10K in the Kindle store — a steady mid-list seller. Sales have softened 61% recently.

Rating & Reviews

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

Currently 4.2★ from 5,812 reviews

Gaining approximately 107 new reviews per month. Reader interest is accelerating. Rating has remained stable at 4.2 over the tracking period.

Sale Prediction

Actual Predicted

This book is currently discounted at $1.99. It typically returns to around $15.01.

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.

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