Private investigator Lone Carter washes up on a beach near Innsmouth, his body destroyed, his life nearly over. As he fades he remembers: his encounter with a Shoggoth was a fatal one. Then darkness — and then an inexplicable return to life, completely healed. Since this rebirth, Carter has been tormented by nightmares pointing him toward a scientific expedition to the South Polar regions, where mountains higher than the Himalayas and the ruins of an alien civilization await inside caverns full of frozen creatures. The mystery pulls Carter through multiple eras and perspectives — ancient Yemen, the Mad Arab Abdul Alhazred, and H.P. Lovecraft himself. Mountains of Madness is the second chapter in the Chronicle of Innsmouth saga, dense with dread, and built to push every player to the edge of sanity.