HarperCollins, £5.99 stg

Grant Blaine is one of Los Angeles' most successful psychiatrists. His wife, Maggie, is a successful lawyer, about to be made a partner in her firm. Together they have only one problem – when to have children. Grant wants to start now; his wife wants to further her career first.

But then Blaine's colleague and mentor, Dr Henry Flemming, is murdered by his usually placid wife. One of Flemming's patients, Jules Bois, transfers to Blaine and so begins Andrew Neiderman's tale of an evil so consuming it leads to murder.

Blaine has been acting oddly since Bois came to him. In fact Bois' visits are having such a detrimental effect on him that his wife questions if he's the man she married at all – just like Lydia Flemming did before she shot her husband. Bois is not who he says he is. So who is he? What does he want with the Blaines, and was he really behind Henry Flemming's death?

'The Dark' is a terrifying, gripping look at the human mind and how it reacts when evil prevails. Andrew Neiderman, author of 'The Devil's Advocate', promises his novel to be "a psychological thriller of unimaginable evil" and it delivers. Excellent.

Joanne Ahern