Maggie O'Farrell's second novel is an intense, unnerving and passionate story of betrayal, loss and love, with all the frisson and psychological intensity of Rebecca.When Lily moves into Marcus's flat and plunges headlong into a relationship, she must contend not merely with the disapproval of flatmate Aidan, but with a more intangible, hostile presence. Could it be that Sinead, Marcus's ex, is trying to communicate with her? When Lily begins to 'see' Sinead, first about the flat, and then on the streets of London, she must question not merely her sanity, but whether the man she loves is someone she can, or indeed ought, to live with at all.