Marking as read since the stories all appeared in either The Golden Ball or Witness for the Prosecution:

• The Red Signal
• The Fourth Man
• S.O.S.
• Wirelss aka Where There’s a Will
• The Call of Wings
• The Gipsy
• The Hound of Death
• The Lamp
• The Last Seance aka The Stolen Ghost
• The Mystery of the Blue Jar
• The Strange Case of Arthur Charmichael
• The Witness for the Prosecution