Agatha Christie said this quote
“ Her sleep was enlivened by several dreams. One where Professor Wanstead's bushy eyebrows fell off because they were not his own eyebrows, but false ones. As she woke again, her first impression was that which often follows dreams, a belief that the dream in question had solved everything. 'Of course,' she thought, 'of course!' His eyebrows were false and that solved the whole thing. He was the criminal. ”