Conversation so far:
When did Mortimer start writing?
World War II.
What type of works did he write?
He worked for the Crown Film Unit under Laurie Lee, writing scripts for propaganda documentaries.
Did he write any novels?
Charade.
When did he write Charade?
CANNOTANSWER.

Question: Did he write any other novels besides Charade?
Self-contained rewrite: Did John Mortimer write any other novels besides Charade?