How is there no review for this card?!
Absolute banger with the right setup.
The new line "If a symbol was revealed during this investigation, return Read the Signs to your hand at the end of your turn." changes friggin EVERYTHING.
Play it in blurse, play it with Olive, play it as Sister Mary or Jacqueline Fine, and consistently grab 2 clues per turn. Bonus points if the Signs say "TCU" - the haunter becomes the haunted!
Heck, the upgrade also boomerangs back if you fail, letting you say "um, okay, I'll just try again next round".
The only caveat: It costs you 2 resources every time, which can get expensive, so you better put on your Robes of Endless Night, which conveniently also only triggers once per round. Alternatively, checking out Prophetic could be worth it, although personally I don't like these kind of cards.
I battle-tested this in the last two Hemlock Vale scenarios and had a blast :)
Side Note: The same goes for Spectral Razor and Ethereal Form, but I think Read the Signs is the most viable overall. However, if you deck-build around symbols I'd probably run them too.