Answer to the mystery clip #1

Vanessa stated that Jacob left the door locked at all times and the only way for the criminal to enter is the window.When X inspected the windows, the windows were locked, and the person inside had to lock the window.
Vanessa either could've helped the criminal kill Jacob by luring him to open the door using her voice which made Jacob lower his defense, or she could've opened the window, killed Jacob, then locked the window and stole the key near Jacob's neck to lock the door from the outside.

Quote of the Day

Imagination is more important than knowledge.
Albert Einstein

-Even if you have astounding knowledge,it would be nothing but work of a robot.

Use your imagination!-