The movie begins with Don (played by David Thewlis), a single father who is struggling to raise his son, Sammy (played by Asa Butterfield), on his own. Don is a bit of a reckless parent, and his relationship with Sammy is strained, to say the least. As Sammy grows older, he becomes increasingly frustrated with his father's lack of responsibility and discipline.

One of the standout aspects of the film is the chemistry between the lead actors. David Thewlis and Asa Butterfield have a natural and believable rapport, and their characters' relationship is both authentic and engaging. Olivia Colman also shines in her supporting role as Sammy's mother, bringing a sense of warmth and empathy to the film.

On IMDB, the movie has a rating of 6.8/10, with users praising the film's humor, performances, and relatable storyline. Some critics have noted that the film is a bit predictable and that some of the supporting characters are underdeveloped. However, overall, the movie has been well-received by audiences and critics alike.

The film explores several themes, including the complexities of family relationships, the challenges of growing up, and the importance of forgiveness and redemption. The tone of the movie is largely comedic, with a touch of drama and heartwarming moments.

Years later, Sammy (now played by Asa Butterfield) is a teenager who is struggling to find his place in the world. He meets a girl named Lee (played by Maisie Williams) and becomes infatuated with her. However, things take a turn when Don reappears in Sammy's life, claiming to have turned his life around and wanting to make amends for his past mistakes.