Blackly comic Thai horror. Dr Taa (Wichan Jarujinda) and seven nurses harvest organs from the hospital where they work to sell them on the black market. When one of the nurses, Tawan (Chon Wachananon), threatens to blow the whistle on this dubious practice, the others - including her own sister, Nook (Chidjan Rujiphun) - waste no time in murdering her. However, Tawan's spirit returns after seven days to wreak its revenge on those who wronged her in a series of ever more elaborate and bloodthirsty killings.
Obligatorily 1p cheaper at amazon of course.