Someone is always watching

They're the perfect couple. James, a high-profile lawyer at a successful City firm, and Bella, a beautiful teacher at a prestigious private school.

Someone is waiting to destroy your perfect life...

Then one night, James loses an important file linked to a multi-million-pound deal and, in a panic, contacts the company's IT helpdesk. A friendly woman answers his call and quickly fixes the issue. All is well once more. But in the weeks after, James is accused of more mistakes at work, ones he doesn't remember making and can't explain. Meanwhile Bella finds herself the target of vicious rumours at school - and no one believes her side of the story.

And it all begann in one phone call.

Who is the woman at the other side of the computer screen? And why do Bella and James suddenly find their privileged existence - their jobs, their marriage, maybe even their lives - in peril?