By His Rule: A Workplace Enemies to Lovers Romance (Callahan Billionaires Book 2)

Name: By His Rule: A Workplace Enemies to Lovers Romance (Callahan Billionaires Book 2)
Price: 5.99 USD
Availability: InStock
Rating: 4.5 (2206 reviews)
Author: Tracy Lorraine

by Tracy Lorraine

Contemporary Fiction Romance

4.5 (2,206)

4.5 stars from 2,206 reviews. Top 78% of Contemporary Fiction books we track.

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Last checked: Jun 3, 2026

Price history: Free – $5.99

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The Deal

Perfect for you if...

You love workplace romance with actual tension, where the power dynamic and professional stakes feel genuinely complicated rather than glossed over.
You're drawn to characters with grit who refuse to accept handouts, even when attraction threatens to derail their independence.
You want steam and angst in equal measure, with a hero who falls first and isn't afraid to show it.

Maybe not for you if...

You prefer slow-burn romance where physical attraction builds gradually over time rather than exploding from page one.
You're uncomfortable with explicit sexual content or find high-steam scenes distracting from character development.
You need your billionaire heroes to be warm and emotionally available from the start, rather than arrogant and demanding.

About this book

By His Rule is the second book in the Callahan Billionaires romance series. The protagonist left her hometown to work for Callahan Enterprises and build a better life for her brothers. She discovers her demanding new boss is Kian Callahan, a billionaire CFO who is entitled, arrogant, and overbearing. He is also her best friend's brother-in-law, and she suspects she only got the job because of that connection. She resents his presence and his power-hungry approach. Despite her dislike of him, the chemistry between them is undeniable, and she finds herself attracted to him against her will. As events unfold, she begins to see that he may be what she needs, even though she doesn't want to admit it. The story involves fake dating and forced proximity as the two navigate their complicated dynamic.

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Price History

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

Free – $5.99

Price has dropped 1 time over the last 2 years.

Sales Rank

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

Currently around #19K in the Kindle store — a steady mid-list seller.

Rating & Reviews

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

Currently 4.5★ from 2,206 reviews

Gaining approximately 96 new reviews per month. Steady word of mouth growth. Rating has remained stable at 4.5 over the tracking period.

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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.