Ada's rather lovely. But I do have a question mark over this.
Not unlike the M&M advert plothole (see below), surely the timing is off? May gets maddened by the ghostly touch, then dragged off to the Scottish-doctor-whose-name-I-can't-remember. She gets saved, but replaced by a robot, unbeknownst to all others (and sod off, spellchecker, unbeknownst is a perfectly good word).
Why? It seems this is to help get the Darkhold, but wasn't its existence only discovered later, and the book itself acquired some time after that?
M&M advert: man comes home, finds his wife in bed with a giant, talking M&M (as one does). Then a second M&M emerges from the closet and says "Scott's home early."
But how would he know Scott's home early? He's been in the closet! And why is he in the closet? The only reason is voyeurism, but then he'd never give himself away.
Riddled with plot holes. 0/10.