Historian Milo Luttrell never envisioned himself plummeting into the depths of an ancient Tanzanian cave. But a mysterious invitation drags him into an African underground labyrinth, alongside a brash billionaire and his elite caving crew, aiming to unravel the century-old mystery of explorer Lord Riley DeWar's disappearance. When a vicious storm severs their link to the outside world, dwindling supplies and bizarre phenomena confront them. Milo must navigate the oppressive darkness to disclose DeWar's deep obsession and the secret behind his eternal absence.