If, during the 1920s, the master criminal was a gamester, criming for self expression, during the 1930s he performed in other ways for other purposes.

The bars and multitude of black squares are common in British puzzles because they allow unchecked letters (called unches)—or letters that don't need to cross with another answer.... There are rules regarding the unches, and traditionally every other letter in a solution should be checked with another letter.

But, leaving novelists alone, on the whole we find in real life that if speech is silvern, silence is essentially golden, and that more harm is done by saying too much than by saying too little; above all, that infinite mischief arises by not letting sleeping dogs lie.

With acted fear the villain thus pursued.