Portal in the Pyramid

Martin was on holiday in Cairo, Egypt, where he checked in to a cheap and dingy 3-star hotel room. He walked around in the city looking inspirations for his new Sci-Fi book when he stumbled across an Egyptian old market/bazaar. He bought a shimmering and glowing blue crystal, which turned out to be an ancient gem that led to a portal to another dimension.A few days later he woke up in the hospital...