Twilight Investigation (Chinese: 囧探查過界) is a 2010 TVB modern drama series.

Former police officer Yip Kwok Cheung (Bill Chan) has set up a private detective agency.

Gei On Gui (Wong Hei) (known best as Encore) is the most important member who specializes in careful thought and sharp deconstruction of dialysis.

Yee Tak was born in an incomplete family, and is withdrawn.

After breaking up with her boyfriend, she becomes drunk and is a victim of a car accident she causes, and dies.