The story:
The Phantom brings Diana to the Deep Woods for a few days' welcome relaxation before Diana has to fly back to the States, but this time is slightly different. Two young boys have started to think about what will happen to the Phantom line if the present incumbent dies without any heirs to carry on the tradition.

Rex and Tomm are unusually keen to accompany Uncle Walker and Diana around, and when the boys overhear a conversation in the Skull Cave about eventual succession and who can be eligible, they decide on drastic action...