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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": "Il segno dei quattro",
  "subtitle": null,
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  "authors": [
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  "description": "La signorina Mary Morstan, una giovane al cui fascino il dottor Watson non si mostra indifferente, si rivolge a Sherlock Holmes chiedendogli aiuto per rintracciare il padre, misteriosamente scomparso qualche anno prima e, forse, tornato a farsi vivo con l’invio di preziosi regali. Un’intricata storia che affonda le radici nella lontana India coloniale, tra le torbide vicende di un tesoro macchiato di sangue.",
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      "title": "Il segno dei quattro",
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      "medium": "paper",
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      "isbn": "978-88-0474-067-4",
      "pages": 144,
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    {
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