Sophie Hannah's unguessable thrillers have readers hooked!'INGENIOUS!I challenge anyone to unravel this clever whodunit' ?????'Sophie Hannah could well be our modern Christie, such a deliciously complicated plot.Her best yet!!' ?????'This murder mystery really did blow my mind.It kept me awake at night! Absolutely brilliant' ?????'This lived up to its press for me.I loved every page -- a truly impossible puzzle!!' ?????What if the only way to prevent a murder is by confessing to it?Jemma Stelling has confessed to a murder - one she can't have committed.She has an unshakeable alibi: when Marianne Upton was stabbed to death outside her home, Jemma was at the police station confessing to a murderous obsession with Marianne and a plan to kill her in precisely the way she was killed. So is Jemma innocent? Or is she an ingenious, cold-blooded murderer?Can someone be guilty of the opposite of murder?PRAISE FOR SOPHIE HANNAH:'A new novel by Sophie Hannah is a cause for celebration!' ALEX MICHAELIDES'One of the best crime writers currently working' SCOTSMAN'High concept and so satisfying' GILLIAN McALLISTER'Brain-bending' GOOD HOUSEKEEPING