The man beside me was not Hercule Poirot.
He was very like him, extraordinarily like him. There was the same egg-shaped head, the same strutting figure, delicately plump. But the voice was different, and the eyes instead of being green were dark, and surely the moustaches– those famous moustaches–?
…The countess leant forward and snatched at Poirot’s moustaches. They came off in her hand, and then, indeed, the truth was plain…
‘This is Achille Poirot,’ I said slowly. ‘Hercule Poirot’s twin brother.’
-The Big Four