Read it through once

In one of the windows over the garage the curtains had been moved aside a little, and Myrtle Wilson was peering down at the car. So engrossed was she that she had no consciousness of being observed, and one emotion after another crept into her face like objects into a slowly developing picture. Her expression was curiously familiar—it was an expression I had often seen on women’s faces, but on Myrtle Wilson’s face it seemed purposeless and inexplicable until I realized that her eyes, wide with jealous terror, were fixed not on Tom, but on Jordan Baker, whom she took to be his wife.