Haniel Long

A gang is the same as a wolf pack; gang members do not use their energies in friendship with one another, for they do not know what friendship is. If they are united, it is by the common bond of a desire to attack their world.

Mysteries include so many things: the noir novel, espionage novel, private eye novels, thrillers, police procedurals. But the pure detective story is where there's a detective and a criminal who's committed a murder and leaves clues for the detective and the careful reader to find.