I'm no longer taking Amazon's recommendations for suspense novels. I was recently disappointed by A Discovery of Witches, and now Sister is getting a big push. Two more boring "thrillers" are hard to imagine. Sister follows snobby, racist Beatrice as she investigates the disappearance and possible murder of her free-spirited sister. Actually, Beatrice has already solved the crime, and is telling the story to a policeman in a series of sessions - which is as annoying a narrative structure as I have ever encountered. The structure only reinforces the repetitiveness of the narrative, and spends far, far too much time detailing Beatrice's coming and goings (She's in transition. Get it? GET IT? DO YOU GET IT YET? WELL, IT'S GOING TO CONTINUE, ANYWAY.). Sister is unusual in that it deals seriously with the depth of Beatrice's grief, a subject that is glossed over in many otherwise similar novels. The thing is, it's glossed over for a reason - it's dead boring, and endlessly repetitive. As another reviewer noted, Beatrice's reliability is slightly called into question as certain aspects of the story ring false, but I personally feel that the flaws are in Lupton's writing and are not intentional. Finally, I don't want to head into spoiler territory, but given the ending of the novel... the herrings are too red, and the reveal is a terrible "Had I But Known" cliche.