This volume includes 13 stories and 1 novel about the private investigator Augustus Van Dusen, more known as The Thinking Machine: THE GOLDEN DAGGER THE THINKING MACHINE THE SILVER BOX THE SCARLET THREAD THE RALSTON BANK BURGLARY THE PROBLEM OF DRESSING ROOM A THE PROBLEM OF CELL 13 THE PHANTOM MOTOR THE MYSTERY OF A STUDIO THE MAN WHO WAS LOST THE HAUNTED BELL THE GREAT AUTO MYSTERY THE FLAMING PHANTOM THE CHASE OF THE GOLDEN PLATE (A Detective Novel)