One of the best in the series. So many details come together to explain and enrich the characters. FBI Agent Pendegast's friends are being murdered as he becomes the prime suspect. Newly promoted Laura Hayward is convinced the unorthodox agent is guilty even tho his faithful sidekick, D'Agosta, knows he is innocent. Pendegast's evil brother, Diogenes, finally appears in full character and is just as interesting as readers suspected. All of the usual characters are present because the setting is once again at the NY Museum of Natural History where there are strange happenings. Nora Kelly is introduced and newspaper reporter, Bill Smithback, is still chasing after his exclusive.