On the island of Caligo (which is Latin for darkness, murk, fog, mist, or to make dizzy or darken), located in the western portion of the North Atlantic, inside of the Bermuda Triangle, a mystery awaits to be solved. Caligo is fairly small, roughly 100 square miles in area and with an elevation about 8,000 feet above sea level. It boasts numerous coral reefs, some visible above the surface of the ocean, and impressive mountain peaks. It has a capital city named Phasmoenia (which is Latin for spirit dwelling), which is the largest city on the island. While Caligo may sound completely ordinary, it cannot be found or located on any modern map. To the satellites in Earth's orbit, the region where Caligo would be found is hazed over under a constant cover of clouds and fog.

Throughout history, there have been various unfortunate souls that have stumbled their way into discovering the enigmatic island, be them sailors, cruise ships, personal planes, cargo planes, or commercial planes. These people, who might have unearthed one of the greatest secrets the world has been keeping, have never been heard from or located by the outside world. Those entering the region of the island have reported equipment failure, compass and navigation problems, and natural disasters, usually in the form of hurricanes or severe thunderstorms. People that discover Caligo and live to make it to the island in one piece are forced to live out their days there, unable to leave. The native Caligoans call these people (and those descended from them) drifters.

While the area of the Bermuda Triangle is one of the most heavily-sailed shipping lanes in the world, with ships crossing through it daily for ports in the Americas, Europe, and the Caribbean Islands, it is only those who pass within just a couple miles of the Caligo island that truly find their demise.