Mountain of Black Glass by Tad Williams continues the epic Otherland series, following a diverse group of travellers as they navigate a vast network of immersive virtual worlds in search of answers to a mystery with far-reaching consequences. As they journey through increasingly strange and perilous realms, they face powerful adversaries, uncover hidden truths, and confront challenges that blur the boundaries between reality and illusion. Rich in imagination and suspense, the novel blends science fiction, fantasy, and adventure into a compelling exploration of technology, humanity, and the power of choice.