The theme of the "Rubaiyat" is that one should live life to the fullest and have no regrets when it ends. The poem's subject led police to theorise that the man had committed suicide by poison, although there was no other evidence to back the theory. The book was missing the words "Tamám Shud" on the last page, which had a blank reverse, and microscopic tests indicated that the piece of paper was from the page torn from the book. Also, in the back of the book were faint indentations representing five lines of text, in capital letters. The second line has been struck out – a fact that is considered significant, due to its similarities to the fourth line and the possibility that it represents an error in encryption.