Detective Investigation Files () is a TV series in Hong Kong about detectives, produced by TVB. The series had four installments, spanning from 1995 to 1999.
The first (1995), second (1995), and third (1997) installments starring:
The fourth installment (1999) is a complete reboot of the series, with new cast led by:
The VCDs of Detective Investigation Files I - IV are now available worldwide.