Before TV started saturating the market with detective shows like CSI, Bones, The Mentalist, Criminal Minds and a myriad other similar shows. And definitely before all this modern technology crime was solved the old fashion way. Columbo, the detective played by Peter Falk, was one of my favourite TV shows when I was growing up.
There are lots of great things about this show:
1) you know who the killer is right from the beginning.
2) the killer does not believe the disheveled-looking police detective working the case will solve the crime.
3) the detective is usually very friendly towards the killer thereby reinforcing the killers belief that he/she got away with the perfect crime.
4) even though Columbo constantly talks about and refers to his wife she is never actually shown making one wonder if he does in fact have one.
All these points and many other quirky little factors makes essential ingredients for a great whodunit.