Penthouse North

Penthouse North also known as Atrapada en la oscuridad and Blindsided is a 2014 thriller film directed by Joseph Ruben and starring Michael Keaton and Michelle Monaghan.

Having returned to America, where her livein boyfriend, Ryan, is desperate to marry her. Sara is planning a party and goes out to buy some supplies when she is knocked over by a cyclist. When she gets home Ryan appears to have stepped out Sara is unable to see his murdered body. When she takes a shower, Ryans killer is revealed to still be in the house, using his blade to push a towel in Saras direction when she cannot find one.Sara discovers Ryans body when she slips in his blood. The killer makes himself known and ties Sara to her bed, asking for the diamond which Ryan stole from him. Sara is shocked by the revelation that Ryan is not the man he made himself out to be. She offers the killer, now known as Chad, the diamond, but then knocks him out and escapes the apartment. She hides in her buildings basement where her friend Antonio hears her calls for help. He tries to save her but Chad slits his throat. Sara escapes to the street when she trips into the arms of Robert Hollander, who promises to keep her safe. ........

Source: Wikipedia