Seedy second-hand car salesman Jakke (Hannu-Pekka Björkman) is believed by everybody in the Finnish port town of Pori to have been responsible for the death of Mirjam (Johanna Kokko), a sometime prostitute whose death in winter went unnoticed until the snows melted. Jakke hires his former classmate Jussi Vares (Juha Veijonen) to clear his name, neglecting to mention that at the time of the death he was knee-deep in an attempt to blackmail a group of powerful local figures.

Based on Jäätynyt enkeli, the fifth book in the series by novelist Reijo Mäki, the second Vares film continues to lampoon Finnish masculinity with the joyous abandon of a drunk tramp pissing on a dumpster fire. Its cast is an utterly ghastly procession of sweaty, flabby, beered-up chain-smokers stumbling through the plot, double-crossing each other in motels and dive bars. Even the sponsors’ logos that begin the film look like a recipe for the worst night of your life, including (if I remember correctly) Karhu beer, an online poker site, and some guy’s kebab shop.

Stories are like pizzas, observes one character sagely. The thinner the base, the tastier the topping. The victim has slept with half of Pori, sometimes for cash and sometimes for love, enmeshing her in a complex web of possible exes and indifferent one-night stands. The police, as in the first film, can’t be trusted – in the film’s biggest plot hole, the entire case might have been more easily solved if they’d just made a cursory examination of the body. Instead, it’s left to Vares to uncover a complex conspiracy involving Swedish hookers, a heavy metal band, a daisy-chain of polyamorous lesbians, a comic-relief transvestite, and a gang of small-town big-wigs with a terrible secret. Meanwhile, the towering bully Veikko (Jussi Lampi) comes home after serving a stretch in a Swedish prison. “Those Swedes understand Finnish well enough,” he growls, raising his fists. “And if they don’t, there’s always sign language.” Yeah, up yours, Sweden! He hates Swedes the way that Indiana Jones hates Nazis, and is always ready to postpone the action for a few minutes while he beats some up, or in one scene, tries to drown a pair in petrol.

Unlike the novel, which took place in winter, the film tries hard to play up the unbearable heat of the Finnish summer. Yes, really. Everybody is sweating, and telling each other how terribly warm it is all the time, which adds a note of unintended comedy for anyone who’s had to wear an anorak in July. Vares deftly uncovers a conspiracy, hunts down some stolen cash, and fights off the hulking minions sent to dissuade him, but it’s only at the end, as he burpily recounts his mission to his drinking pal Luusalmi that everybody realises he’s forgotten to solve the actual killing.

Jonathan Clements is the author of The Armchair Traveller’s History of Finland.