Greetings CrystalRiver, great to see you posting again.

Don't know if this helps, but was all I could find.

Audiobook;

Arthur C Clarke reads Childhood's End. (52:53)

https://youtu.be/ZgxWfTqkARY?si=AHSAP3dCGV6Lsk4z

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In the late 20th century, the United States and the Soviet Union are competing to launch the first spacecraft into orbit when alien spaceships suddenly position themselves above Earth's principal cities. After one week, the aliens announce they are assuming supervision of international affairs, to prevent humanity's extinction. They become known as the Overlords. In general, they let humans go on conducting their affairs in their own way, although some humans are suspicious of the Overlords' benign intent, as they never allow themselves to be seen.

The Overlord Karellen, the "Supervisor for Earth," periodically meets with Rikki Stormgren, the Secretary-General of the United Nations. Karellen tells Stormgren that the Overlords will reveal themselves in 50 years, when humanity will have become used to their presence. When the Overlords finally reveal their appearance, they resemble the traditional Christian folk images of demons, with cloven hooves, leathery wings, horns, and barbed tails. Humankind enters a golden age of prosperity at the expense of creativity.

The Overlords are interested in psychic research,

link

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Fox.