# The Love Hypothesis

> A Reylo fan fiction became a BookTok romance hit with 541K print copies sold.

- Owner: Ali Hazelwood / Berkley
- Kind: Book
- Sector: Media & publishing
- Seed date: 2021-08-30
- Observed peak date: Week of Oct 13, 2022
- Date basis: Observed peak within the documented measurement window; not an all-time maximum. Dates use the stated precision; chart positions are date anchors.
- Spread Score: 29 (Niche), v1.2
- Mechanics: Maker origin, Creator relay, Platform jump, Press loop, Identity badge

## Summary

Book of the Month members ordered early copies in August 2021; paid TikToks followed in September. The novel reached No. 1 on PW’s trade paperback list. PW reported 541K print sales by September 2022.

## Timeline

- 2021-05-24 — Publishers Weekly (Press) — Publishers Weekly reviewed Hazelwood’s debut before its release.
- 2021-08-30 — Book of the Month members (Retail) — Book of the Month members ordered the novel as a September selection.
- 2021-09-06 — @chamberofsecretbooks (TikTok) — @chamberofsecretbooks posted a paid Book of the Month TikTok; two more paid creators followed that month.

The full timeline, metrics and sources are on the case page, or via the Pro API (https://howitspread.com/developers).

Canonical URL: https://howitspread.com/cases/the-love-hypothesis

Cite as: How It Spread (2026). “The Love Hypothesis.” Case HIS-01378. Spread Score v1.2: 29/100. Updated 2026-10-22. https://howitspread.com/id/HIS-01378