"The Paris Apartment" is a novel by Lucy Foley that revolves around a young woman named Jess who arrives in Paris to visit her brother. However, she discovers that he is missing, leading her to unravel a web of secrets and lies among his neighbors in the apartment building. As Jess investigates, she encounters a cast of intriguing characters, each with their own hidden agendas. The story unfolds with suspense and mystery, exploring themes of trust, betrayal, and the complexities of human relationships in a vibrant urban setting.