Karl Weber's "The Monocle"
This book is that of the famous writer that Frank has made this trip to feel closer to. Frank buys a fresh copy of this book before his journey, but in the woods, one day he comes across 'The Imposters' copy of the book, which has been heavily annotated and studied, making Frank feel inferior.
I made these books by purchasing two green vintage books, which I then laser cut my book design onto.