Mysterious Murder, Part One 1951 streaming

Fong Yim-fun puts on a tour de force as an ill-fated woman, separated from her lover through an arranged marriage to the terminally ill and impotent son of a warlord. The power struggle within the family led to an inevitable murderous consequence. Seven years later, the heroine's ex-lover, now an ambitious detective, is keen to solve this almost forgotten case, only to discover that he is also part of the enigma.