The Inheritance Games By Jennifer Lynn Barnes

She came from nothing. They had everything. How far will they go to keep their fortune? Avery only has one plan: keep her head down, win a scholarship and work for a better future. Until an eccentric billionaire dies, and leaves her almost his entire fortune. And no one, least of all Avery, knows why. Suddenly she must move into the secret passage filled Hawthorne House, where every room bears the billionaire’s love of puzzles, riddles and codes. On top of that, Avery must share the mansion with all his surviving relatives – a family hellbent on discovering how she got ‘their’ money.