Cinematic action masters Johnnie To and Wai Ka-fai return with the explosive Mad Detective, an incendiary adventure full of delightfully off-kilter events and a fascinating journey into the human psyche. When a missing detective’s gun is implicated in a recent series of heists and murders, a hot shot inspector HO (Andy On) seeks out his former boss, BUN (Lau Ching Wan), a gifted criminal profiler now living in seclusion with his wife MAY (Kelly Lin). Bun has a truly unique gift: he can see the inner personalities of the people he meets. As Bun travels further into the psychosis of a prime suspect his unorthodox approach begins to wear on Hos mind. What begins as a quest for answers has now taken a schizophrenic turn where truth and lies, reality and delusions intertwine…