The story:
Once a year, the Phantom puts an advert in the town paper asking for any information that will reunite his ward Rex with his real parents. This effort is usually met with silence, but this year is different: Uncle Gus and Auntie Elsie provide enough information to convince the Phantom to hand over Rex to his new guardians in London.

When nothing is heard from Rex for a long time, despite promises to the contrary, the Phantom initiates more searching probes of Rex's new family, and receives enough information to urgently set off for London...