Twisted Proposal by M.V. Miles
Jail is the last place fifteen-year-old Addison Solomon expected to wind up when she ran away. Not that this is a big surprise: her life has been on a downward slide since her drug-addicted aunt died, leaving her alone and penniless.
When her long-lost father appears, whisking her away with him to his mansion and second family in sunny California, Addison soon discovers that her new wealthy relatives are not exactly people she should trust.