header book
The Spanish phrase 'libro de cabecera' does not exactly translate to 'header book' in English. A more accurate translation would be 'bedside book'. This is usually a book kept conveniently at one's bedside for casual or intermittent reading.
My bedside book is 'One Hundred Years of Solitude'.
In this example, the speaker is referring to their favourite book which they keep at their bedside. A bedside book is a book that you read before going to sleep.
I am looking for a new bedside book to read at night.
Here, the speaker is in search of a new book to read before sleep, a book that will be kept at their bedside.
Grandma's bedside book is the Bible.
This sentence informs that the grandmother's preferred book, which she places at her bedside, is the Bible.