Struggling to connect with those around him, a teenage math prodigy trains for the International Mathematical Olympiad, where a budding romance with a fellow contestant breaks through his emotional walls and teaches him that love cannot be calculated.

• Original Pictures
• Head Gear Films
• Asa Butterfield
• Rafe Spall
• Sally Hawkins
• Eddie Marsan
• Jo Yang
• Alex Lawther
• Alexa Davies
• Martin McCann