Ah, the delight of these old mysteries. This one involved the murder of two men with a good deal of suspense and international intrigues to complicate the issue. Nero Wolfe and his assistant, Archie Goodwin, work hard to unravel the mystery surrounding the deaths. Wolfe is asked to help a young woman named Neya Tormic who claims to be his adopted daughter. She is accused of stealing diamonds. It seems that she stole nothing when the man accusing her says he found the diamonds after all. Then he is murdered. While trying to discover who did the murder, another murder is committed. Everyone is confused because the murdered men are both agents from other countries and those countries are not forthcoming about what those men were doing in the U.S. It takes time and a great deal of initiative to discover who the murderer is. When all is said and done Wolfe finds he has a daughter after all.