"It won't hurt much on the back of your legs, Mr. Mole," said Harry.

They enjoyed a quiet grin to themselves at this.

The prison doctor then sent the gaoler for writing materials for the purpose of writing out a prescription.

Then was their chance.

"Doctor," said Jack, "I want to see the governor."

"Why have you not asked, then, through the gaoler?"

"I prefer some other method."

"Why?"

"Because I don't know whether the gaoler is safe."

"I don't understand you," said the doctor.