{
  "display": {
    "icon": {
      "id": "minecraft:written_book"
    },
    "title": "Book Worm",
    "description": "Find a book written by an unknown traveler"
  },
  "parent": "survivalplus:adventure/items/items",
  "criteria": {
    "mechanics": {
      "trigger": "minecraft:inventory_changed",
      "conditions": {
        "items": [
          {
            "predicates": {
              "minecraft:written_book_content": {
                "author": "Unknown"
              }
            }
          }
        ]
      }
    }
  }
}