Seventh volume of the Cthulhu Mythos gamebooks.

Unspeakable cults, ritual murders, abysmal horrors rising from the confines of space and time... It was only a matter of time before your sanity was swallowed up by the surge of the unknown, a fragile island lost in an infinite sea. You have landed in a padded cell in Arkham Asylum, the largest psychiatric institution in the world.

Will its corridors offer you a safe and peaceful place where you can regain your sanity? Will you survive the most modern treatments that will be administered to you? Or will you discover the thin line that separates reality from the unthinkable?