there are no small parts (I know it's a cliche - LOL - but in this
instance, it's true) - the real leads are the young couple who run
the bed and breakfast that the play takes place in.

the characters are classic agatha christie 'types' - the over-
bearing, officious lady; the nervous, sensitive young man; the
masculine, no nonsense spinster; the sweet young girl and her
sweet young husband; the smart, savvy policeman (who is also
the most fun to play, by the way)...they're all fun. They run the
gamut of ages from young adult to middle-aged...nobody is
really doddering and elderly.

I"ve seen it directed and performed as a serious murder
mystery and I've seen it directed and performed as a high camp
put-on of murder mysteries. They both worked.

Though I'm not a huge fan of old war horses, as a rule - this one
really DOES hold up and is quite fun to both perform and
watch.

edited to add: I'm sure a quick google search will bring up
TONS of info for yourself - this is a very well known piece and
lots has been written about it over the past fifty years