One Year with the Billionaire Grump: A Marriage of Convenience Enemies-to-Lovers Romance (Billionaire Grumps)

Name: One Year with the Billionaire Grump: A Marriage of Convenience Enemies-to-Lovers Romance (Billionaire Grumps)
Price: 2.49 USD
Availability: InStock
Rating: 4.5 (823 reviews)
Author: Gwynne Hart

by Gwynne Hart

Romance Dark Romance

4.5 (823)

4.5 stars from 823 reviews. Top 92% of Romance books we track.

$2.49KU17% off peak

Last checked: Jul 2, 2026

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Price history: $0.99 – $2.99

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Price range: $0.99 – $2.99

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Perfect for you if...

You love enemies-to-lovers with actual heat and banter that crackles on the page.
You're here for high-stakes revenge plots that get complicated by genuine feelings.
You want a marriage of convenience that doesn't feel like either party is settling.

Maybe not for you if...

You need slow-burn romance. This one moves fast once the heat starts, and it doesn't apologise for it.
You prefer your billionaires reformed from the jump. This one's still scheming when they meet.
You're uncomfortable with morally grey characters pursuing revenge, even if they get their comeuppance.

About this book

Kate Hartley proposes a one-year marriage to a billionaire CEO pursuing a takeover of her company. He agrees: she keeps her startup safe, and he gains an uncontested path to complete his acquisition. When Kate moves into his penthouse with her dog, they clash immediately. A PR photoshoot demands they display chemistry, and a backstage kiss ignites genuine attraction between them. Their pretend honeymoon in Tuscany becomes real, and he finds himself drawn to her laugh and intensity. Complications arise: he still intends to erase the Hartley name in retaliation for what her father did to his family. As the year progresses, he must decide whether to protect her startup and prove he is not her enemy before time runs out, or risk winning his revenge at the cost of losing her. This is a standalone romance featuring enemies-to-lovers and marriage of convenience tropes, with a guaranteed happy ending.

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Price History

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

$0.99 – $2.99

Price has been stable at $2.49 for 11 months. This book rarely goes on sale.

Sales Rank

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

Currently #7,853 in the Kindle store — a top-10K bestseller. Sales have softened 116% recently.

Rating & Reviews

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

Currently 4.5★ from 823 reviews

Gaining approximately 77 new reviews per month. Steady word of mouth growth. Rating has climbed from 4.3 to 4.5. Recent readers are rating it higher.

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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.