{
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  "title": "Znak czterech",
  "subtitle": null,
  "url": "https://www.bookquiver.com/arthur-conan-doyle/pl/znak-czterech/9788373992764",
  "publisher": "Rytm",
  "translators": [],
  "medium": "paper",
  "duration_seconds": null,
  "narrators": [],
  "isbn": "978-83-7399-276-4",
  "pages": 140,
  "published": "2006-02-10",
  "language": "pl_PL",
  "cover": "https://quivercdn.com/covers/rytm/arthur-conan-doyle/znak-czterech-seria-klasyka_978-83-7399-276-4-71216b16.jpg?v=2026-08-27%2019%3A27%3A14",
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  "markdown": "https://www.bookquiver.com/arthur-conan-doyle/pl/znak-czterech/9788373992764.md",
  "binding": "Hardcover",
  "description": "Słynny detektyw Sherlock Holmes wraz ze swoim przyjacielem dr. Watsonem podejmują się rozwiązania zagadki, która dręczy Mary Mortansen - piękną i młodą damę. Po tajemniczym zniknięciu ojca, Mary każdego roku otrzymuje piękną, lśniąca perłę...",
  "book": {
    "title": "Znak czterech",
    "slug": "znak-czterech",
    "url": "https://www.bookquiver.com/arthur-conan-doyle/pl/znak-czterech"
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  "authors": [
    {
      "name": "Arthur Conan Doyle",
      "slug": "arthur-conan-doyle",
      "url": "https://www.bookquiver.com/arthur-conan-doyle"
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