I can do things like

query {
  allBooks(first: 1, filter: {name: "To Kill a Mockingbird"}) {
    id
  }
}

Hello, every schema type created comes with a search for one object of its type. You can try doing this

query {
  Book(id: "the-book-id") {
    id
  }
}

or with query variables:

query getBook($id: ID!) {
  Book(id: $id) {
    id
  }
}