Book by R. Gary Patterson that examines "the Great Beatle death clues" which apparently exist in the Beatles' songs, album covers, videoclips etc about the rumored death of Paul McCartney in 1966 and his secret replacement by the fake Paul. So, according to this book, either Paul is dead and there really is a huge conspiracy, or for a while in the Sixties everyone went a little nuts on the topic...

The subtitle of "I Am the Walrus" was No, you're not, said Little Nicola. She was right. In "Glass Onion", on the subsequent "White Album": "the walrus was Paul", and he was wearing the "walrus costume" on the Magical Mystery Tour cover. The walrus is associated with death in certain cultures, or so I've read, in the various explanations of the
clues to Paul's death to be found in Beatles lyrics.