Liv Constantine is a pen name used by the writing duo of sisters Lynn and Valerie Constantine. They are known for their engaging psychological thrillers that often feature strong female characters and intricate plots. Their books have gained popularity for their suspenseful storytelling and unexpected twists. The sisters began their writing journey after both pursued careers in different fields, including marketing and education. They have collaborated on several novels, with their debut, "The Last Mrs. Parrish," receiving critical acclaim and becoming a bestseller. Their work continues to captivate readers around the world.