ice from Mr. de Verona’s ice bucket.
The pieces of ice in the glass which Mr. de Verona put in the safe were not made of water.
Hans had made them by freezing ginger ale!
Hans never did open the safe. He never even entered the room. He simply waited in the hall for an hour.
The second clue, the one “no man could have heard,” was the sound of the frozen pieces of ginger ale melting.
When Mr. de Verona opened the safe, the pieces of ice had all melted, filling the glass with ginger ale!
Solution to The Case of the Stomach Puncher
Biff said that the bike had been lying “under the canvas ever since I bought it two months ago.”
Yet when Encyclopedia removed the canvas, the bike lay on grass that was “green.”
Had the canvas been covering the bike and the ground for two months, the grass would have died.
Dead grass is brown, not green.
The green, live grass proved the canvas had just been put over the ground and the bike.