Newspaper editor Albert Lake sacks his assistant Larry Spence after passing a story to the Courier. Spence blackmails Lake's mistress Marie Dickson but strangles her. When Lake plays down the murder in the Sentinal, Spence blackmails him.
Captain Edge reports, to the police, two men disposing a body on the sea bank. When the body can't be found his granddaughter asks Mark Saber for help. Saber and assistant Paul Paulson find the body and believe the suspects are locals.
10-year-old Peggy asks Mark Saber to help her catch a spy. Her father, Philip Carstairs works for the Government and Peggy has seen her step-mother Stephanie looking at his secret work and now plans to send her away to school.
Mr. Poole asks Mark Saber to help his wife while he is on a trip to Paris. She has been diagnosed with a terminal illness and he fears she make commit suicide. When Saber arrives at their flat she is dead but it soon looks very suspicious.
The body of Dora Daine is discovered, by the police. This is the third murder of it's kind and is known as the "Full Moon Murders". The suspect "John Smith" has many alias's. Ann learns he is now in Brighton using the name Captain Brigham.
Street artist Socrates Smith and Detective Mark Tower are unlikely friends. Tower is on the trail of burglar Longhair. During one robbery, Tower falls for Lady Carol. When she receives his love letters there can be only one suspect.
Ray Prentice has a shadow on the lung and has just three months to live. With an insurance policy about run out without a medical, he decides get a hit-man to kill him. When he learns the doctor made an error he needs Mark Saber's help.
George Peters leaves a trunk in an exclusive London hotel. When the maid opens the trunk she finds a dead body. Fearing bad publicity the hotel asks Mark Saber for help. He learns Harry Quinn has gone missing and his bank account emptied.
Michael Gerard is selling forgeries and getting Jim Peters to paint them. When Peters disappears his wife contacts Mark Saber for help. Gerard is planning to steal the Madonna from the Grosvenor Art Gallery and replace it with Peters copy.