I shall be quicker." The Duke handed the keys to him, and, one after another, the inspector fitted them into the lock.

It was useless.

None of them opened the door.
"They've given me the wrong keys," said the Duke, with some vexation.
"Or no--stay--I see what's happened.

The keys have been changed." "Changed ?" said the inspector.

"When?
Where ?" "Last night at Charmerace," said the Duke.