The Clue of the Gleaming Hair (Eve Shampoo Advert)

Luscious hair solves a mysterious disappearance.

Celebrity endorsement is nothing new, as this 1937 advert shows. Made in the form of a short film, it features star of stage and screen Sally Gray, who's reported missing on the eve of a first night. Luckily, the detective in charge has extraordinary powers of deduction and his expert knowledge of women's hair products reveals the truth.