Siblings Farrah and Bosley Legazpi are forced to make a journey back to the Motherland. Their father’s last wish was for his ashes to be sprinkled in the newly minted ‘natural wonder’ – the Underground River of Palawan in the Philippines. During the tension-filled journey, the two must sort out their father’s affairs as well as their own relationship. When they discover that one of them is an aswang (a Filipino witch), 30+ years of feelings come to a boil. Is it easier to accept a sibling’s cruel nature if it is steeped in the supernatural?