Margin of Error

Margin of Error

by Rachel Lacey

4.4 (1,936)

4.4 stars from 1,936 reviews. Top 81% of Contemporary Fiction books we track.


$2.49KU50% off peak

Last checked: Jun 3, 2026

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Perfect for you if...

  • You're looking for a sapphic romance where both characters are figuring out their sexuality for the first time and it feels genuine, not rushed.
  • You want a story grounded in real emotional stakes: a woman rebuilding her life after trauma finds unexpected connection with someone who's chasing her own ghosts.
  • You appreciate romance that weaves mystery and personal growth together, where the relationship deepens as the characters uncover truths about themselves and each other.

Maybe not for you if...

  • You need a mystery that's the main plot rather than a subplot; this is fundamentally a character-driven romance that happens to involve a cold case.
  • You prefer romance where both characters have their lives fully sorted before they meet; both Marin and Charlotte are actively rebuilding and questioning who they are.
  • You're not interested in first-sapphic-relationship narratives; exploring sexuality is central to both characters' journeys here.

About this book

Two years after a near-fatal accident in Manhattan, Marin has rebuilt her life. She left her husband, job, and home to pursue her long-held dreams, including teaching statistics at Northshire University and dating women for the first time. She unexpectedly reconnects with Charlotte, a woman she encountered the morning of her accident and has thought about since. Charlotte has also made significant changes, moving back to her Vermont hometown to investigate the thirty-year-old mystery of her mother's disappearance. What begins as an unexpected friendship between the two women deepens as Charlotte questions her sexuality and realizes her feelings for Marin go beyond friendship. Despite being each other's first romantic experience, their chemistry feels undeniable. As they pursue both the mystery of Charlotte's mother and their growing relationship, the very circumstances that brought them together threaten to pull them apart.

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Price History

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

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Free$2.50$4.99Aug '25Jun '26
$4.99$4.99

Currently on sale at $2.49 — 50% off peak. Price has dropped 1 time over the last 10 months.

Sales Rank

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

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#360#1,082,463#2,164,566Sep '25Jan '26Apr '26Jun '26

Currently #4,721 in the Kindle store — a top-10K bestseller. Climbing the charts — 56% improvement recently.

Rating & Reviews

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

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3.5★4.3★5.0★Feb '26Mar '26Mar '26May '26RatingReviews

Currently 4.4★ from 1,936 reviews

Gaining approximately 541 new reviews per month. Reader interest is surging. Rating has dipped slightly from 4.6 to 4.4.

Sale Prediction

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Free$2.50$4.99Aug '25Jun '26PredictedJun '26

Actual Predicted

This book is currently discounted at $2.49. It typically returns to around $4.99.

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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Rachel Lacey

1 book on Vagrant Press

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