The Assistant (Broché)

Someone knows your secret. Someone's going to tell. When Jo is offered the chance to move into her best friend's spare room rent-free, she's delighted. The flat is gorgeous - and it's a fresh start. But then Jo gets the sense she is being watched. She doesn't know who. She doesn't know how. But someone is coming for her, and they know her secrets. As a fierce winter brings London to a standstill, Jo struggles with the terror.
Who is out to destroy her ? An enemy, or a friend ?