The Fixer by Jennifer Lynn Barnes 400 pages

Tess Kendrick has lived with her grandfather ever since her parents died, but when he gets dementia, Tess is sent to live with her older sister, Ivy. Tess has no idea that her sister is the famed "fixer" of Washington, D.C., however, when she school at Hardwicke, she soon learns what it means to be a fixer. After Tess helps a girl with her problem, everyone starts coming to Tess for help. 

When a Supreme Court Justice dies in surgery, Tess's friend Vivvie comes to Tess and to confess that she believes that her father killed him. Tess brings Ivy into the investigation and secrets start coming to light. When Tess is kidnapped by a secret service agent, she learns her biggest truth yet - Ivy is really her mom. Ivy exchanges herself for Tess and Tess must make a deal with the devil to get her back. 

If you like the t.v. show Scandal, you will like this book.