Closure (2007)

There is instant chemistry between Alice (Gillian Anderson), a businesswoman, and Adam (Danny Dyer), a younger working-class man who installs a security system in her London apartment. She takes him to a party in the country, and they end up making love. But the night turns horrific when they encounter three thugs who maim Adam and *** Alice. The incident turns them into fearful recluses until Alice spots the leader of their attackers (Anthony Calf) — and the two victims plot a brutal revenge.