The PA's Revenge (Book 1, The Mackenzie Brothers)

Cassandra Lee is determined to exact revenge on the man she believes to be responsible for the death of her father and son. She studies his business and becomes his PA with the aim of sabotaging his fortune. But one thing she's not prepared for is to be seduced by the powerful and sexy Dallas Mackenzie. She just hopes that his interest—and her resistance—will hold out long enough to ruin him...