Ertugrul, launched in 1863, was a sailing frigate of the Ottoman Navy. While returning from a goodwill voyage from Japan in 1890, she encountered a typhoon off the coast of Wakayama Prefecture, subsequently drifted into a reef and sank. The maritime accident resulted in the loss of 533 sailors, including Admiral Ali Osman Pasha. Only sixty-nine sailors and officers survived and returned home later aboard two Japanese corvettes. The event is still commemorated as a foundation stone of Japanese-Turkish friendship. Wikipedia.

Olivia, A New York-based journalist travels to Turkey when she receives news that her sister Marla is pregnant. Marla recently ended a relationship but decides to keep the baby and that's when sinister things begin to occur.