In his latest novel, John Irving explores - in his inimitable way - the ways in which our pasts reverberate in our presents and, indeed, our futures.

Juan Diego’s little sister is a mind reader. As a teenager, he struggles to keep anything secret - Lupe knows all the worst things that go through his mind. And sometimes she knows more. What a terrible burden it is to know - or to think you know - your future, or worse, the future of someone you love. What might a young girl be driven to do if she thought she had the power to change what lies ahead?

Later in life, Juan Diego embarks on a journey to fulfil a promise he made in his youth. It is a long story and it has long awaited an ending, but Juan Diego is unable to write the final chapters.

This is the story of what happens when the future collides with the past.