I agree there are some pretty good scenes with Mrs. Johnson and Harry, also with Adam, Carolyn, and Nicholas Blair. As to why Harry disappeared, I was told by a most reliable source that it was because the Adam Story was coming to a close. Adam himself just disappeared too as I recall. So my theory is that Mr. Slocum left to do something on his own. He was on Broadway too, and went back and forth from the east and west coasts, also did a tour. He started acting when he was 17 years old, and passed away at 38. He did a lot in that 21 year period. On Dark Shadows, wasn't "Mrs. Johnson's daughter", only mentioned once by Mrs. Johnson, very early on in the series? I have thought this was another one of the writers blunders and they forgot what was said, so it turned out instead Mrs. Johnson had a son. As I recall also in the show, the character of Dr. Hoffman was to have been a man. Harry Johnson did not know who he was dealing with, the Collins family notorious for supernatural goings on, Nicholas Blair a warlock, and don't forget Monster Man Adam, there was also a witch, vampire, and ghosts on the premise besides that. Not exactly a good place for even a good con man to single out his victims. Harry had all odds against him. This group would be a challenge for anyone! We all have different opinions about the actors on Dark Shadows, and we all have our fave. Craig Slocum is mine!