In the Church of Saint-Sulpice, Paris, there is a holy water font. It was made of a shell of the giant clam, Tridacna gigas. I often wondered where it came from because these clams are only found far away from Europe. I found it intriguing that the shell already arrived in France in the early sixteenth century as a gift from the Venetian Republic to King Francis I. Where did it come from? What story could such a shell tell? What thoughts did the sculptor, Jean-Baptiste Pigalle have when he carved the beautiful column upon which the shell rests? What is its religious significance? Only a few pearls from giant clams are believed to exist, and their origins are shrouded in mystery. Is there a pearl somewhere belonging to this clam? It will have to be the Pearl of Saint-Sulpice, alias the Pearl of Allah. The pearl took me on an unexpected adventure to the French Revolution and before, to a1964 scientific meeting where the descendants of the secret league of the Scarlet Pimpernel unites and onwards to the Turkish invasion of Cyprus in1974 where I faced the prowess and strength of the guardians of Aphrodite in the Troodos Mountains. Join me if you dare.