R. Austin Freeman was an early 20th century British writer of detective stories. Dr. Jervis is approached by a man who tells him he has a friend who is very ill and needs his help. He cannot tell the Doctor where the man is but he is desperately ill. Jervis gets into a coach with no windows-completely dark so he will not know where he is going. When he arrives he enters a side entrance and finds a comatose man perhaps drug induced. Two very strange Germans-a man and woman are the only people attending him and cannot imagine how he could get morphine and insist it must be sleeping sickness. Dr Jervis consults his friend Dr. Thorndyke who figures out the solution in a very intricate way. The question is - can you?