Unknown Number (2019)

緝兇二十年不忘使命 神秘來電直指塵封懸案

Through a mysterious Motorola phone, two detectives - one from the present, and the other from 15 years in the past - begin communicating and working together to solve cold cases.

Themesdetectivemurderpast and presentpolice departmentpolice profilingremakeserial killersignal