Isaacs is the secondary antagonist of the 2011 action thriller film Hanna. He is a sadistic serial killer fiercely loyal to Marissa Wiegler.
He is portrayed by Tom Hollander, who also played Lord Cutler Beckett in the Pirates of The Caribbean films.
Isaacs is first seen in a Safari Club where Marissa Wiegler arrives to hire him to capture Hanna. We see the first of Isaacs's sadism when he asks Marissa if she would like him to kill the girl, though Marissa tells him to just find her, implying that she wishes to kill her with her own hand. She kisses him lightly on the cheek before leaving the club. Isaacs and his team of assassins briefly find Hanna with a British family near Lille, but Hanna manages to kill at least one assassin, and when we see Isaacs briefly, but also dangerously, pursuing Hanna, she escapes him by jumping into the sea. So Isaacs instead holds the British family hostage and he and Marissa find out from them that Hanna is going to Berlin to see her father, Erik Heller. While arriving at Wilhelm Grimm's house in Berlin with Marissa and his remaining thug, Isaacs violently head butts the house's host, Mr Grimm and demands information from him.
Isaacs finds out that Mr Grimm believed Erik was Hanna's real father, as everyone else does, and that he knew Hanna's mother, Johanna Zadek. While informing Marissa what Mr Grimm said, the two nasties agree that Erik is not Hanna's biological father, laughing at the idea that he is. After Erik's confession, Isaacs arrives in his car to kill both the foster father and his adopted daughter. While chasing Erik, he taunts him by calling him a little piggy for basically running instead of fighting him valiantly enough. After the car chase, Erik ambushes Isaacs's sole remaining follower and kills him but then Isaacs himself appears and savagely ambushes Erik. However, just before meeting his end at Marissa's hands, Erik overpowers Isaacs with his powerful kicks and then impales him with the same metal rod Isaacs was using in his own attempt to kill him.