"Expect a few chills to run down your spine as you work your way through this sharp debut" (CrimeReads) about a young mother who can't shake the feeling that her son's imaginary friend is putting him in very real danger--perfect for fans of Lisa Jewell and Mary Kubica. All children have imaginary friends, Georgina tells herself. It's perfectly normal, and they all grow out of it in the end. But when her seven-year-old son,...