Half a Confession (2004)

Soichiro Kaji killed his wife who suffers from Parkinson's disease, he surrenders to police two days later. Tops of the police wish an early settlement of the affair by fair means or foul because he is a former detective and an instructor at police academy now. Detective Shiki questions Kaji closely about what he did two days after the murder, however Kaji keeps silent about it. What was he doing for two days? Why doesn't he confess it?