Green with Envy

It all begins when fellow P.I. John Henning is found dead, an ostensible suicide. In his will, Henning leaves half of his earthly possessions to Polo (the other half to the Catholic Church and Alcoholics Anonymous), and names Polo his executor.

A Key leads Polo to a local bank and Henning's safety-deposit box, where he discovers a cache of "drops of oil"-priceless Colombian emeralds. But where would Henning, a lone-wolf P.I., have gotten the money to buy such exotic jewels? And why would a ...