Harry does show remarkable presence of mind when he talks Adam out of strangling him on the spot by saying that Miss Stoddard sent him.
Nicholas tells Cassandra, The first order of business is to find Lang and find out all he knows. Cassandra replies, Unfortunately, that’s impossible--Dr. Lang is dead. Not missing a beat, Nicholas says, Well, that does present some problems--but they’re not insurmountable.
Shame on those lazy writers, who actually made poor Craig Slocum say, Blackmail is such an ugly word!
I remember Nicholas's wonderful gestures as he summons Dr. Lang from the beyond. Lang tells him all about the experiment. Julia! Julia! he calls as if still trying to send her his last, urgent message. Nicholas graciously thanks him and sends him back to the beyond, well pleased with this night's work.