Of all the Agatha Christies I have in the house, the only one that actually shows people digging is at an archaeological dig, not a graveyard.
Interestingly, it turns out that bald!Poirot, who I’d always assumed to be an homage to David Suchet, actually predates the TV series by several decades. This copy is from 1953. In the books Poirot always has a good head of dark hair (it’s an important plot point in Curtain, for heaven’s sake!) and he’s almost as proud of it as he is of his moustache, but on this one’s cover he’s got hardly any. Poor Poirot.