A woman declared dead three years ago has just knocked on Mara Voss's door.
Late one rainy night, divorce solicitor Mara Voss opens her door to a frightened woman named Isabel. She says her husband has found her. She needs somewhere safe to stay.
Mara knows exactly where to hide her: Apartment 6.
Less than an hour later, Isabel has vanished.
The door is locked from the inside. The sixth-floor window offers no escape. On the floor are three drops of blood and a wedding ring.
Then the police identify Mara's mysterious visitor.
Isabel Vale disappeared three years ago and was later declared dead.
Her husband was investigated.
His name is Adrian Vale.
And Mara has been sleeping with him for the past two months.
Now evidence is beginning to point in impossible directions-and some of it points directly at Mara.
Someone knows about Apartment 6.
Someone has been watching.
And someone is counting on Mara believing the first story she hears.
A claustrophobic psychological thriller about marriage, obsession, deception, and the dangerous difference between knowing someone and knowing the truth.