The Legend of Vox Machina, the Whitestone Chronicles

"Critically injured and seemingly abandoned by her brother after the murder of her family, Cassandra de Rolo finds herself at the mercy of Whitestone's usurpers. Much to her shock, Delilah and Sylas Briarwood treat her with the utmost care-almost like a daughter-as she recovers within the relative safety of her own childhood bedroom. On edge and suspicious of their motives, Cassandra adapts to survive while processing the trauma of her family's demise and Percy's abandonment"-- Provided by publisher.