Less than five years after 2014’s modestly successful Z Storm, David Lam’s ICAC franchise is still strongly storming through the alphabet: with each new installment, box office results grow, while the light in Louis Koo’s eyes gets dimmer and dimmer. He returns as officer William Luk, a poster boy for the ICAC (Independent Commission Against Corruption, lest anyone forgot), a character which after four films still has the depth of, well, a poster. This time, Luk goes undercover in a prison where corruption runs rampant between a few powerful inmates – including wealthy heir Cao (Raymond Lam) – and most of the wardens, headed by superintendent Sham (Patrick Tam). There, his mission is made all the more risky by the presence of Wong (Gordon Lam), a former detective Luk himself put behind bars in Z Storm.

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