# Iron Flame

> A BookTok sequel sold 584,667 US hardcovers in its launch week.

- Owner: Rebecca Yarros / Entangled Publishing
- Kind: Book
- Sector: Media & publishing
- Seed date: 2023-11-07
- Peak date: Week of Nov 11, 2023
- Date basis: Dates use the stated precision; chart positions are date anchors.
- Spread Score: 43 (Notable), v1.2
- Mechanics: Scarcity drop, Identity badge, Fandom mobilisation, Platform jump, Press loop

## Summary

Iron Flame launched with publisher-organised midnight parties and celebrity promotion. Readers wore costumes and posted reactions, then exposed printing defects. Its US hardcover chart recorded 584,667 first-week sales. Interest revived around Onyx Storm in 2025.

## Timeline

- 2023-07-10 — FairyLoot (Retail) — FairyLoot announced a signed edition with stencilled edges and bonus content.
- 2023-09-12 — TODAY / Red Tower Books (Press) — TODAY published an authorised excerpt and gave November 7 as the release date.
- 2023-09-18 — Entangled Publishing (Open web) — Entangled listed midnight release parties across the US and Canada.

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/iron-flame

Cite as: How It Spread (2026). “Iron Flame.” Case HIS-00605. Spread Score v1.2: 43/100. Updated 2026-10-17. https://howitspread.com/id/HIS-00605