The Lost Hero / The Son of Neptune / The Mark of Athena / The House of Hades / The Blood of Olympus
No romance or no physical intimacy at all.
Closed door. No anatomical or crude language.
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Blurb
Heroes of Olympus Complete Collection 5 Books Box Set Titles in the Set: The Lost Hero The Son of Neptune The Mark of Athena The House of Hades The Blood of Olympus
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The Dark Prophecy
Same Camp Half-Blood world, quests and demigod found-family, but told by a snarky fallen god, so the humor is more self-mocking and the violence rougher.
The Lost Hero
It's the opening volume of the same quest, so the amnesia hook and demigod camp crew feel identical — just a single entry point rather than the whole arc.
The fallen kings
Shares the sprawling ensemble-as-family and wartime stakes, but trades Greek gods for grounded WWI historical drama with adult romance and grief.
Poséidon
Another teen discovering a hidden mythic heritage and destiny, only here the sea-kingdom plot centers on romance rather than quest-team banter.
Of Neptune
Same chosen-one demigod-of-the-sea vibe with lighter stakes; the focus is a love triangle instead of world-ending prophecy battles.
The Last Field Party
Keeps the close-knit friend group and coming-of-age warmth, but trades mythology for small-town football drama and couple-focused storylines.