Dick solves the puzzle. He has been dreaming about the Dead Sea Scrolls. These scrolls from the Qumran Essene community were found in 1946 in the Judean desert, so they weren’t exactly a brand new discovery when Dick wrote this letter. Nonetheless he is convinced that is what he is tapping into at night. Jim Pike studied the scrolls so perhaps this is because of Jim’s influence. 

I’m not sure how serious he is when he tells Claudia to be careful who she tells about all of this.

In a second letter to Claudia Dick tells her about more dreams. In addition to the mysterious book he dreamt about the Cumaean Sibyl and a Cyclops. This leads him to Virgil’s Aeneid and an exploration of Greek and Roman myths. 

The sibyl tells him in a dream whoever broke into his home in San Rafael in 1971 and 1972 was looking for papers related to his friend Bishop Jim Pike. 

The glossary notes Claudia Bush was a grad student at Idaho State University who corresponded with Dick while working on her master’s thesis. 

In a letter to her Dick tells her about a dream he had that was trying to direct him to a book of some significance. All he could see in the dream was a hardbound blue book with a title that ended in the word ‘Grove.’ He eventually finds a book in his library that matches this description, a biography of Warren G. Harding called The Shadow of Blooming Grove, but it turns out to be ‘the dullest book in the world.’ In a postscript he tells Claudia to never take dreams too seriously.