In this episode, the Director of the BBC Home Service learns by stealth that the ancient Babylonian scroll of Purdom—the beginning of all music—has been found by a half-witted Syrian dustman in a cave in the valley of the Euphrates. He immediately fits out an expedition under Ned Seagoon LRAM to locate the scroll and bring it back by hook or by crook for the Home Service to broadcast every Tuesday night, thus leading to a revival of interest in sound radio.