Step one: Wait for a really hot day. Place egg on lightly oiled tin foil. Step two: wait a long time.
I forgot to say that after Henry and the invisible wife left there are now tourists in residence and as I am preparing the egg I hear loud sighs of oh my god it's hot in here. (Don't know why it has gone italic). Henry doesn't have air conditioning. I bet they are just delighted to find they have rentedthe house from hell. Wait until the local police do their monthly check on the whereabouts of the invisible wife. I pray they don't fall on any knives like my other neighbour or have tooth ulcers because it's always me that goes to the hospital or doctor's with people that have troubles while visiting this resort. At least now the big hospitals have official interpreters.