You will take 2 Horror just by reading the card text out loud.

Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur! Hastur!

Contray to the other review here, I would argue (at least in four player) it is the worst treachery in the game. The potential to have it stay out for six+ turns, in a deck filled with horror, much of which is unavoidable, cannot be understated. Just one of these can easily cause 10+ horror across a team, and woe betide if you end up with two on the table at the same time. With two a guardian can go from full sanity to out of the game in a single mythos phase without even drawing from the bag. Brutal.

This is not the worst treachery in the game; it's often very mild, especially compared to things like Psychopomp's Song and Death Approaches, since you can often get it on an act or agenda ready to advance, but the artwork always makes me smile; it's funny and chilling.

I have a question regarding this card. Does the Forced effect of the card kick in only when you place horror on your investigator card or does it also work if you place it on any of your assets e.g. Cherished Keepsake, Peter Sylvestre?