Kind of Cruel, the seventh installment in Sophie Hannah's acclaimed Zailer & Waterhouse crime series, is nearly impossible to unravel until its final pages. Hannah's intricate, multi-voice narrative explores the elusive, malleable nature of memory as played out in a baffling criminal investigation involving some odd remembered words and the brutal death of a stranger. To help develop the plot of this novel, Hannah actually had some hypnotherapy herself, which helped her form the idea for the beginning of the plot and the surreal hypnotherapy session her character goes through.