Conversation so far:
What is Elidor?
Elidor is a children's fantasy novel by the British author Alan Garner, published by Collins in 1965.
When did Alan Garner play Elidor on the radio play?
In 1962, Alan Garner began work on a radio play named Elidor, which would result in the completion of a novel of the same name.
What is The Owl Service?
The Owl Service is a low fantasy novel for young adults by Alan Garner, published by Collins in 1967.
What was the Owl Service about?
The story is adapted from the mythological Welsh woman Blodeuwedd, who appears in the Fourth Branch of the Mabinogi.
Did The Owl Service win any awards?
The Owl Service was critically acclaimed, winning both the Carnegie Medal and Guardian Children's Fiction Prize.

Question: What can you tell me about the Red Shift?
Self-contained rewrite: What can you tell me about the Red Shift?