EMERALDS ARE FOR EVILShirley was sultry, sexy, smashing-a sweet young thing to make a sugar daddy's mouth water. This luscious lass loved pretty baubles, so no wonder men showered her with jewels. But when a deluge of emeralds turned into a reign of terror, Shirley needed someone to bail her out.That brought Bertha Cool and Donald Lam into the act, as the indomitable detective duo discovered that emeralds could be a girl's worst enemy when they carried a price tag of murder…