The Pelican Brief by John Grisham

Two Supreme Court Justices are dead, their murders unsolved. But one woman might have found the answer. Darby Shaw is a brilliant New Orleans legal student with a sharp political mind. For her own amusement, she draws up a legal brief showing how the judges might have been murdered for political reasons, and shows it to her professor. He shows it to his friend, an FBI lawyer. Then the professor dies in a car bomb. And Darby realises that her brief, which pointed to a vast presidential conspiracy, might be right. Someone is intent on silencing Darby for good – somebody who will stop at nothing to preserve the secrets of the Pelican Brief…