The Inheritance Games Series 3 Books Collection Set By Jennifer Lynn Barnes (The Inheritance Games, The Hawthorne Legacy & The Final Gambit):

The Inheritance Games:
She came from nothing. Avery has a plan: keep her head down, work hard for a better future. Then an eccentric billionaire dies, leaving her almost his entire fortune. And no one, least of all Avery, knows why. They had everything. Now she must move into the mansion she's inherited. It's filled with secrets and codes, and the old man's surviving relatives - a family hell-bent on discovering why Avery got 'their' money. Now there's only one rule: winner takes all. Soon she is caught in a deadly game that everyone in this strange family is playing. But just how far will they go to keep their fortune?

The Hawthorne Legacy:
One step forward. Avery thought that solving the riddle left by billionaire Tobias Hawthorne would reveal why he left her - a complete stranger - his entire fortune. Two steps back. But as the cryptic clues tale an unexpected twist and the handsome and enigmatic Hawthorne grandsons continue to pull her in different directions, Avery can't help but wonder who she can really trust and who is just looking out for themselves. What happens when the truth just hides more secrets? Soon Avery realizes this game is no longer just about money and power. Now she's playing for her life.

The Final Gambit:
To inherit billions, all Avery Kylie Grambs has to do is survive a few more weeks living in Hawthorne House. The paparazzi are dogging her every step. Financial pressures are building. Danger is a fact of life. And the only thing getting Avery through it all is the Hawthorne brothers. Her life is intertwined with theirs. She knows their secrets, and they know her.