An audaciously twisty psychological thriller in which finding the killer is only one of two mysteries its anti-heroine, Cate Winter, tries to unravel. The other: when pushed to extremes, what is she herself capable of? Cate Winter, at 34, is a wildly successful neuroscientist and entrepreneur who has invented a cure for Alzheimer's that will improve the lives of millions. On the verge of selling her biotech company for an obscene sum,...