{"product_id":"9780575101357","title":"The Martian Sphinx","description":"By the twenty-first century the world was drowning in its own population. A solution had to be found quickly - and it was, in 'gravi-power'. Wonderful, unending source of power - only the scientists knew that its use was reducing the Earth's distance from the sun at a dangerous rate. But if another planet's gravi-power could harnessed . . .   An expedition was launched to Mars, known to be uninhabited - except that a woman was wandering around its surface who claimed she had come from another galaxy to warn Earth of a terrible menace, and there was a huge poly-hedron of metal emanting a force very much like that of gravipower.   Someone else had discovered it! A thousand years ago, or now? Friend, or enemy?    (First published 1965)","brand":"Orion Publishing Group, Limited","offers":[{"title":"Default Title","offer_id":47066906394864,"sku":"9780575101357","price":6.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9780575101357_p0.jpg?v=1763720448","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9780575101357","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}