uh... I already saw this movie.. with David Gyasi. It's called "Panic".
The Woman in the Window
An agoraphobic developmental psychologist befriends her neighbor across the street from her New York City brownstone, only to see her own life turned upside down when the woman disappears and she suspects foul play.
Panic
An agoraphobic journalist is drawn into London's underworld when his beautiful neighbor across the street disappears and he suspects foul play.