In modern, rural Ireland, Connell and Marianne, on different ends of their school's social scene, begin an intense, secret affair.

Connell betrays Marianne by making a cowardly choice. Marianne withdraws from school, causing Connell intense guilt.

Connell finds college lonely; Marianne finds instant popularity. After running into each other they decide to try to be friends.

Connell joins Marianne's social circle but doesn't fit in. He apologises for how he treated her; she reconsiders her relationship with her new boyfriend, Gareth.

Connell and Marianne are together, but when he loses his job and she has an upsetting trip home, they withdraw from each other.

Marianne and Connell are seeing other people and realise (too late) that their break-up was due to a misunderstanding.

Connell visits Marianne at her family's summer home in Italy, where tensions between her and Jamie are at an all-time high.

Marianne, studying abroad, pursues an unhealthy relationship; in Dublin, Connell enjoys an uncomplicated relationship with Helen.

After a tragic event, Connell struggles with severe depression. Marianne remains a lifeline for him from abroad.

In Sligo, Marianne and Connell try to navigate friendship. A fight between Marianne and Alan causes a rift with her family.

Their final year in Trinity, Marianne and Connell are fully together - but how it will endure after they graduate is uncertain.