Beneath the world . . . The Mexican cenotés. Flooded caves that fracture the Yucatan Peninsula – places of mystery, the unexplored, and of ancient sacrifice. When Alex meets an old friend while travelling, he doesn’t realise how far the encounter will take him. For Rick is exploring deep beneath the surface of the world, discovering new cave systems, one leading to the next. And when Alex is compelled to follow he has no way of knowing just how deep he will be expected to go, or how dark are the places he will find there . . .