You are a secret agent in the service of the KGB. After a delay when your superiors thought your cover had been blown before you even left Russia, you successfully infiltrated MI6 and worked for several months under the pseudonym of Flynn Smith before receiving a warning that this time you really must get out. You spent a long period hiding out on the island of Reunion before finally being summoned to Cairo, where you met a man from the Russian embassy who told you that your escape route back to Russia was being prepared.
It's taken far too long - unfortunately, MI6 has a strong presence in the Middle East as well as the KGB, and you need to avoid being picked up by the British - but finally you receive a mysterious email which seems to fit with the pattern of those you've received before from your superiors:
From: World Wildlife Fund < firstname.lastname@example.org >
Sent: Wed, 14 Dec 2016 12:07PM +0400
Subject: Please donate to help save endangered animals
Dear Mr Smith,
All over the world, unique and special animal species are dying out due to persecution, habitat destruction, and climate change. We at the World Wildlife Fund, along with other similar organisations, put every possible effort into preventing the human destruction of nature, but we need YOUR help to do so. Donate now to help us in our fight to save animals such as these:
Any amount of money, no matter how small, could help to make a difference to our world. We eagerly await your aid.
the World Wildlife Fund
It takes you a while to figure out the hidden message - the first image throws you for a while, until you notice its age, and the last few don't seem to fit at first. But eventually you have it all worked out, and begin to plan the next stage of your journey. Soon you'll be on your way back to the motherland again, after far too long out in the field.
What is the hidden message?