BookRank

Reading order

Gallagher Girls reading order

Ally Carter

  1. I'd Tell You I Love You, But Then I'd Have to Kill You2006
  2. Cross My Heart and Hope to Spy2007
  3. Don't Judge a Girl by Her Cover2009
  4. Only the Good Spy Young2010
  5. Out of Sight, Out of Time2012
  6. United We Spy2013
7.67.6 / 10
320 ratings
Score
6 volumes
Volumes
2006–2013
Published
about 30 h
Reading time
Completed
Status
Spy & espionage
Genre

Quick answer

I'd Tell You I Love You, But Then I'd Have to Kill You
Start withI'd Tell You I Love You, But Then I'd Have to Kill You2006 · Volume 1 of 6
Open the volume →Buy the first volumeListen to the audiobook

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Publication order

6 volumes2006–2013Completed

  • Light young adult spy fiction: Cammie Morgan attends the Gallagher Academy, a school for genius girls that is secretly a school for spies, and her first crush complicates everything.
  • Read in order — the later books build a bigger conspiracy.
  • The first book is the most read and the lowest rated; Cross My Heart and Hope to Spy rates clearly higher.

A plan for the whole series

6 volumes, 1,711 pages, about 30 hours. At 45 min a day that is about 6 weeks.

58%

Share of volume 1’s readers who reach the last volume. Chance of reaching the last volume: high

Stages

2 stages, with 1 short book from outside the series between them. You finish around December 19, 2026, 9 days later than in one go.

  1. Stage 120 habout 4 weeksby November 25, 2026
  2. BreakMaus · Art Spiegelman · 295 pp. · score 9.05 h, by December 4, 2026. A short book from another shelf, so you come back to the series hungry.
  3. Stage 211 h15 daysby December 19, 2026
    • 5. Out of Sight, Out of Time2012 · 320 pages · 6 h
    • 6. United We Spy2013 · 293 pages · 5 h
  4. The end of the series
    December 19, 2026
In one goDecember 10, 2026about 6 weeks
In stages, with breaksDecember 19, 2026about 7 weeks · +5 h of other books

We count 1.1 min per page, the pace of an average novel reader. Faster? Move the slider.

How this plan is calculated

The plan comes from the pages and ratings of each volume: we split the series into stages of about three weeks’ reading, size each break to the stage before it, and read the chance of finishing from how many readers rate the last volume compared with the first. How we work out the plan →

Every volume in order

Read: 0 of 6
  1. I'd Tell You I Love You, But Then I'd Have to Kill You
    I'd Tell You I Love You, But Then I'd Have to Kill You2006 · 203 ratingsStart here
    7.57.5 / 10
  2. Cross My Heart and Hope to Spy
    Cross My Heart and Hope to Spy2007 · 117 ratings
    7.87.8 / 10
  3. Don't Judge a Girl by Her Cover
    Don't Judge a Girl by Her Cover2009 · Not ranked yetBuy
    –Not ranked yet
  4. Only the Good Spy Young
    Only the Good Spy Young2010 · Not ranked yetBuy
    –Not ranked yet
  5. Out of Sight, Out of Time
    Out of Sight, Out of Time2012 · Not ranked yetBuy
    –Not ranked yet
  6. United We Spy
    United We Spy2013 · Not ranked yetBuy
    –Not ranked yet

Order checked by hand · Order and years: Wikidata (CC0). Spotted an error? Tell us. · Data updated October 29, 2026

Frequently asked questions

Which Gallagher Girls book is the best?

By reader score, Cross My Heart and Hope to Spy (7.8/10). The lowest-rated is I'd Tell You I Love You, But Then I'd Have to Kill You (7.5/10).

Which Gallagher Girls book is the longest?

“Out of Sight, Out of Time” is the longest at 320 pages; the shortest is “Cross My Heart and Hope to Spy” with 236 pages.