The entire novel is written in epistolary structure in the form of letters, emails, instant messages, and newspaper articles.

The book reached number one in Ireland and UK and was a best seller internationally.

Where Rainbows End is a story told through letters, emails and instant messaging about the ever-changing relationship between the two main characters Rosie Dunne and Alex Stewart.

One question remains throughout the book, were they always meant to be more than friends and will they risk everything including their friendship on love?

It was directed by Christian Ditter, and stars Lily Collins as Rosie Dunne and Sam Claflin as Alex Stewart.