Lord Peter goes undercover at Pym's, an advertising agency, his mission, to discover who caused the death of employee Victor Dean, who plunged to his death down a spiral staircase.
Such a great watch, I've always thought it a real shame that we only have five stories with Carmichael's wonderful Wimsey, the aristocratic investigator would appear annually for five years, next up The Nine Tailors.
This really is a great watch, it's a fantastic story, tremendously adapted from a great book, it is very deep, highly absorbing and deliciously intriguing.
What starts off as a simple whodunnit, soon turns into something a whole lot more engaging.
Awesome production values as you will have come to expect on the show, great costumes, lavish sets, true quality associated with The BBC at the time.
Phenomenal acting, Carmichael as I've mentioned at his best, he plays the two roles with real vigour, but we also see the best of Paul Darrow, and some great acting from Fiona Walker and Peter Bowles.
My advice, get through part one, it is a little slow, and feels a little studio bound, once you're past that it really does open up into a cracking watch.
Excellent, 9/10.