“Very pretty, very pretty indeed, young gentlemen. So sorry to bore you longer. You will be interested to know that my lookout on the hill tells me the police have just left Heartfield’s in their cars. They should reach here in about fifteen minutes. But you must not become too impatient. You see, I have a surprise for you and for them. In slightly over a quarter of an hour, this house and those in it will go shooting skywards—in other words, blow up. Good-bye again,—I must fly now, and I’m sure my news will help you keep your courage to the very end.”