"The Unexpected Professor" by Arthur Porges is an exciting thriller that combines elements of an adventure novel and a detective story. The main character, Professor John Stevens, has long since devoted his life to the study of the mysterious civilization of ancient Indian tribes. One day he receives an invitation to participate in an important archaeological project in the Amazon. However, upon arriving at the excavation site, he encounters complications and mysterious events that threaten not only his research, but also his own life. "The Unexpected Professor" captivates the reader from the first pages and keeps him in suspense until the last page, revealing the secrets that are hidden in the depths of ancient underground cities.