Following an accident in her mid-twenties, Christine wakes up every morning to find her memory completely wiped.

She doesn't even know that the man lying in bed beside her is her husband.

Now forty-seven, she has started keeping a journal on the recommendation of a doctor. They hope it may lead to a cure.

Instead, it sends her on a voyage of self-discovery that rocks the foundations of her world, and has terrifying implications both for Christine and the people who love her.

:: If you want to have a little taster of the book, you can download an extract here for free.

PDFDownload the first chapter of 'Before I Go To Sleep' (Contains adult themes).

For information on how to download Acrobat Reader for PDF files visit the BBC Webwise site.

SJ Watson was born in the Midlands and now lives in London. He worked in the NHS as an audiologist for many years. In 2008, he was accepted in the first Faber Academy 'Writing A Novel' course, and Before I Go To Sleep is the result.

SJ will be on Drivetime from 1800 on Monday 9 May to talk to Simon about his book.

If you're reading 'Before I Go To Sleep' along with the Book Club you can chat to other readers on this page during SJ's interview.

Also SJ will be answering questions LIVE on this page straight after the interview.

Why not apply to be a special reviewer for future editions of The Radio 2 Book Club?