"Elmer's Upset" is an exciting detective puzzle from the author Robert Arthur. This book tells the story of Elmer, who finds himself involved in the complicated case of the disappearance of a valuable masterpiece of painting. During the investigation, the hero faces complex characters and secrets of the past, trying to solve the mystery of the crime. Readers will find themselves on the edge of their seats as they watch every twist and turn of mystery unfold, leading to a surprise ending. "Elmer's upset" is an exciting book that will capture the reader from the first pages and will not let go until the last.