The 2019 thriller The Informer centers on Pete Koslow, a former U.S. soldier turned FBI informant, who is forced to return to prison to infiltrate New York’s Polish mafia. The film. Based on a novel by Anders Roslund and Börge Hellström, initially struggled at the box office, earning just $2.9 million globally; However, it has since gained traction with audiences through streaming, according to Collider.

Plot and Characters

In the film. Koslow, portrayed by Joel Kinnaman, is drawn back into a dangerous world after a botched FBI operation leaves a police officer dead and Koslow abandoned by his handlers. He is then coerced by the mafia boss Ryszard ‘The General’ Klimek to act as a drug dealer from within the high-security prison Bale Hill. Meanwhile, FBI agent Erica Wilcox (Rosamund Pike) and Ana de Armas’ character, Sofia, watch from the outside as Koslow works through a treacherous web of loyalty and betrayal.

The cast includes several notable actors in supporting roles, including Clive Owen, Common, and Eugene Lipinski as ‘The General.’ The German film outlet TV Spielfilm praised the film’s taut, no-frills storytelling and the strong performances, particularly from Kinnaman and Lipinski.

Behind the Scenes and Reception

Directed by Andrea Di Stefano and Matt Cook, the film was an international co-production; While it did not perform well at the box office, it received positive critical reception, with a 62% audience score on Rotten Tomatoes. Spanish outlet IGN España noted that the film’s second life on streaming has allowed it to reach a new audience in 2026, years after its initial release.

Korean outlet 씨네21 emphasized the high-stakes tension in the film, describing it as a story about a secret informant dealing with the power struggles of the FBI, police, and a drug cartel. Critics like Song Kyung-won and Park Pyeong-sik gave the film a score of 6 out of 10, praising its suspense and balance in the second half.

Real-World Parallels and Impact

The Informer shares thematic similarities with real-life cases of informants operating in dangerous environments — it mirrors the complex moral choices faced by those who must serve dual loyalties—both to their handlers and to their own survival. The film’s depiction of an informant being abandoned by the very agency that deployed him adds a layer of realism often seen in true undercover operations.

While The Informer is not a documentary, it highlights the high costs and risks associated with infiltration missions. As noted in TV Spielfilm. The film’s portrayal of Koslow’s internal conflict and the external pressures from the FBI, police, and mafia reflects the real-world challenges of such operations.