The product is an expansion for Arkham Horror: The Card Game. There is no option to play separately with only the add-on, the main game is required.
Rumours of murders at Arkham's most prestigious hotel have reached your ears, and after receiving a note inviting you to come, you decide to do so. Only after starting to investigate mysterious murders do you lose consciousness and wake up next to a fresh corpse.
The police are looking for you, so you and your team need to find out what's going on, who killed this man, and why you don't remember anything. Will you find out what happened or be the next victim?