Beyond it was dense black space. A rush of cool, dry, ancient-dust-smelling air drifted around them.Isis’s fingers tightened on his upper arm. “Am I imagining this?”“Surreal, isn’t it?” Thorne wedged the backpack into the gap, then pushed his arm through the opening, holding the torch aloft. Isis crowded behind him, her hand on his back as she tried to see around him.She studied the area. “Who used this? An alien?” Her fingers curled into the back of his shirt. “I wish I hadn’t said that. People believed aliens did help build the pyramids…”“I doubt aliens need stairs,” Thorne told her dryly, passing the torch deeper into the void.“Stairs? Seriously?” Her slender fingers dug into his upper arm, her excitement contagious. “Woo-hoo!”“Don’t get excited. We have no idea where they lead.”“I’m guessing down,” Isis suggested, resting her head on the back of his shoulder as he assessed the situation. Thorne loved the feel of her soft breasts pressed against him.