Question: When was Boneland, the sequel to "The Weirdstone of Brisingamen" was written by English author Alan Garner in what year?
Sentence (from "The Weirdstone of Brisingamen"): Garner began work on the novel, his literary debut, in 1957 after he moved into the late mediaeval house Toad Hall, in Blackden, Cheshire.
Relevant evidence: No