Instruct: Classify a given review into positive or negative sentiment.
Query: A clever and chilling psychological thriller...

Steven Gage was executed for murdering a vast amount of women. Five years later, Callie Thayer, Steven's ex-lover, receives threatening letters and experiences strange occurrences. Callie hadn't expected the nightmare she now lives. Her daughter and boyfriend might be in danger. The perpetrator has made it clear that it is payback time. Is Steven Gage somehow responsible for said nightmare, or is there something far more sinister going on? There are some chilling and disturbing twists in this novel.The Anniversary is quite a clever thriller. The building of tension is intense -- and the aforementioned tension kept me turning the pages until the wee hours of the night. Amy Gutman has created a wonderful novel full of suspense and thrill rides. I couldn't recommend this novel enough.