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While American singer Guy Lambert is performing in England, teenage heiress Jill Conway falls head-over-heels in love with him, and he also captures the attention of sophisticated Claire Dunham. In an attempt to forestall the possibility of romance, Jill's uncle and guardian, Gerald Waverly, sends her to school in Brussels, unaware that Guy has a singing engagement there. After a series of near-fatal accidents, it soon becomes apparent to Guy that someone is trying to kill Jill. Furthermore, the young couple are being closely watched by a pair of bumbling thieves who have hidden smuggled jewels in Guy's luggage. In Brussels, the Belgian police and a trio of ineffectual detectives try to help but prove to be of little use. Appointing himself as Jill's protector, Guy exposes Uncle Gerald and Claire Dunham, who is revealed to be Gerald's accomplice, as the would-be murderers who had hoped to inherit Jill's fortune. A mysterious stranger who had been trailing Guy turns out to be a Scotland Yard man, and he apprehends the jewel thieves. With all threats to their happiness removed, Jill and Guy return to England.