A Hole in the Sky
A teen girl on a failing generation ship uncovers hidden truths and races to save her people before the air runs out.
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Similar in plot structure
These books are ranked using the plot structure labels extracted for Castle Roogna.
Plot structure labels used: backstory reveal, quest-driven, time slip, coming-of-age arc, interwoven past and present, mystery resolution, episodic adventure, setup for later books
Focused on “midbook shift” where exact label matches exist.
This does not mean the books share the same plot, setting, quality, or difficulty. It means their plot structure embeddings are close.
Fluke
A stray dog with human memories roams England, searching for the truth behind his past life.
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Marking Time
A graffiti-tagging teen time traveler hunts her missing mother through Victorian London and a hidden world of immortal bloodlines.
The Philosopher Kings
After a utopian city fractures, Apollo and his daughter sail into the unknown on a grief-driven quest.
The Ship Who Searched
A young girl disabled by an alien illness becomes a brainship and hunts for the plague’s source with her chosen partner.
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Above World
A brave young Kampii leaves her failing undersea colony to find answers in a dangerous future world.
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The Sword of Rhiannon
A rogue archaeologist’s tomb raid on Mars hurls him into the planet’s forgotten, ocean-filled past.
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Time Chain
Three women linked across eras unravel a future man’s secret while time travel pulls them toward love, danger, and apocalypse.
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The Vagrant
A mute wanderer, a baby, a goat, and a magic sword cross a demon-warped wasteland toward humanity’s last refuge.
Frost and Fire
On a deadly planet where people live only days, one young man races to change humanity’s fate.
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The Last Adventure of Constance Verity
A world-saving adventurer tries to quit destiny by killing her fairy godmother and claiming an ordinary life.
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The Search for WondLa
A sheltered girl leaves her underground home and crosses an alien world to find other humans and the truth of WondLa.