This suspenseful story from 1962 was the last
episode of THRILLER that host Boris Karloff acted
in, and he gave an effective performance as
Doctor Konrad Markeson. Or maybe I should say "Doktor"
because that's how he incorrectly spells the word!
My only complaint is that it takes place in a dusty old
mansion, as too many episodes did. But somehow that
doesn't take away from a well-done script.
The guest stars are Dick York (before Bewitched) and
Carolyn Kearney.
Coincidentally, Elizabeth Montgomery had done a
THRILLER that same season with Tom Poston, the amusing
vampire story "Masquerade".