Love
If "love is the secret" to [fill in the blank and then Google] then it couldn't be too much of a secret. Still, everyone once there is a turnaround enough -- such as when a Greek politician known for promoting the country's thousands years hatred toward the Turks suddenly finds their interests worth promoting -- that you are sure there has been some secret behind it. And, in this case, it is the Greek man's love (or at least lust) for a Turkish woman.