From the publisher's website:
Alone and enshrouded in pitch blackness, you fumble about, searching for some source of light. As your shouts for help echo through the darkness, panic begins to grab hold of you. How can any place be so dark? Have you gone blind? How could you even know for sure? Then the whispers start, and your sanity begins to slowly unravel...
Whispers in the Dark is a fixed 60 card Asylum Pack that contains 20 different never-before-seen cards based on the dark mythos of master horror writer H.P. Lovecraft, designed to augment existing decks and add variety to the Call of Cthulhu metagame.
This is not a stand-alone deck; you must have additional Call of Cthulhu LCG cards to play.