Note on scope: the sources consulted document the premise, structure and reveals below, but not a beat-by-beat account of the final scenes; nothing here is invented to fill that gap.
The mechanism. The film's foundational reveal is that the annual elimination list is not a rogue operation but standing practice — the Prime Minister has troublemakers of every kind removed each year in the name of raison d'État. Serge Shuster, a senior official close to the Presidency, does not stumble onto a conspiracy from outside; he is a beneficiary of the system who is placed on the list by a machination he did not initiate. The forty-eight-hour window given to the elite government hit team is what converts a political thriller into a siege.
The central twist. Léo, the family's odd gardener, is not what he appears. Every earlier scene of him tending the grounds is retroactively recoded once his capabilities surface: the film has been hiding a lethal operative in the most socially invisible role available. This is the engine of the whole picture — the Shusters' salvation was on the payroll the entire time, unrecognised, and the state's professionals have no idea what is waiting at the address on their file.
Why the state secret matters. Serge is not hunted for what he did but for what he now carries. Because the knowledge is what condemns him, it cannot be surrendered, negotiated away or confessed — which is precisely why the family cannot go to any authority. The film's structure forecloses every institutional exit, forcing the story into the house and turning the domestic space into the last defensible ground.
What becomes clear afterwards. On reflection the film's real joke is structural: the two 'gardeners' in the story are the Prime Minister and Léo. Both prune. One does it to keep a system tidy, the other to keep a family alive, and the film's moral architecture rests entirely on that distinction. The self-aware humour about Van Damme's age reads differently in hindsight too — the ageing body is the disguise, and the underestimation that fuels the comedy is the same underestimation that gets the assassins killed.