<https://the-little-bookshop.nl/product/secret-seven-01-the-secret-seven-enid-blyton/#product>
<http://schema.org/description>
"It's their very first adventure, and the Secret Seven super-sleuths are already on the trail of some really weird clues. It's snowing and the Seven are dressed in disguise, following a lead to a spooky old house - and a mystery."
<https://the-little-bookshop.nl/product/secret-seven-01-the-secret-seven-enid-blyton/>