[JenB]

Can't be certain for A.C. Doyle, but I'm pretty sure the butler never did it in the Agatha Christie novels...

[Corin Stormhands]

"We owe it all to Agatha Christie and Arthur Conan Doyle..." is actually part of the lyrics from the themesong to "Something's Afoot."

It's a musical spoof on movies such as "And Then There Were None (Ten Little Indians)"

One of the song's says "Something's afoot...and the butler didn't do it." (the butler is the first to die)