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  "formats": "Każda podstrona ma dwie wersje z tymi samymi danymi: JSON (adres strony + .json) i markdown (adres strony + .md). Do każdego `url` w tym dokumencie można dopisać .json albo .md.",
  "title": "El signo de los cuatro",
  "subtitle": null,
  "slug": "el-signo-de-los-cuatro",
  "url": "https://www.kolczanksiazek.pl/arthur-conan-doyle/es/el-signo-de-los-cuatro",
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  "description": "Un capitán desaparecido, un oscuro pacto y un valioso tesoro robado. El caso más enigmático de Sherlock Holmes. Tras la misteriosa desaparición de su padre, Mary Morstan empieza a recibir valiosas perlas de un remitente desconocido. Después de unos meses de silencio, el generoso remitente le propone a Mary que se reúna con él, con dos condiciones: debe ir a solas o acompañada de dos...",
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    {
      "title": "Le Signe des 4",
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    {
      "title": "Il segno dei quattro",
      "language": "it_IT",
      "url": "https://www.kolczanksiazek.pl/arthur-conan-doyle/it/il-segno-dei-quattro"
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