Obsession by Karen Robards

Katharine Lawrence survives a horrific attempt on her life, only to feel like a stranger in her own home. She's twenty-nine, the special assistant to the head of the CIA, and she can trust no one. Her neighbor, Dr Dan Howard, appears to be the only person she can trust, yet she feels that everything is a big lie, yet not and is disoriented and fearful. Robards spins a tale of suspense and terror that keeps you reading, turning each page to discover what happens next. Again, a good read. Sandy P