The Twin Mystery

Nick Carter is a fictional detective who first appeared in 1886 in dime store novels. Over the years, different authors, all taking the nom de plume Nicholas Carter, have penned stories featuring "America's greatest detective". In this story, Nick receives a letter foretelling of a murder. His wife, Edith, believes it was from a woman... but who is the Brown Robin, and why taunt the great detective? - Summary by Lynne Thompson