Underground Worlds Books

Delve into thrilling underground worlds with this curated book collection. Journey through hidden cities, forgotten tunnels, and subterranean realms. Perfect for fans of adventure and mystery.

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Underground Worlds Series in Order:

  1. Agatha Oddly: The Secret Key (2020)
  2. Agatha Oddly: The Silver Serpent (2021)
  3. Agatha Oddly: Murder at the Museum (2022)
  4. Agatha Oddly: Theられたおもい出 (2023)