The film's secret superhero is Maisie Williams as Lucy.

iBoy is a sparky film, embedded in London's cheek-by-jowl world of wealth and poverty. It's also a dark teen drama, peppered with brutal beatings, gang rape, drugs and dead bodies.

There is a persistent and disconcerting joylessness about this.

Despite a long list of issues, iBoy's familiarity means it's a safe, enjoyable watch. It's never going to be challenging any of its inspirations, but as far as escapism goes, it's a winner.