Detective and mystery stories. The coin of Dionysius.--The knight's cross signal problem.--The mystery of the vanished petition crown.--The Holloway flat tragedy.--The disappearance of Marie Severe.-- The mystery of the poisoned dish of mushrooms.--The ghost at Massingham mansions.--The tragedy at Brookbend cottage.--The last exploit of Harry the actor.--The ingenious Mr. Spinola. Selected With An Introduction By E F Bleiler.