SANTA CRUISE

Mary Higgins Clark and Carol Higgins Clark (Simon and Schuster, £9.99)

Mary Higgins Clark made her name in the 1970s with a string of romantic thrillers about well-heeled, but vulnerable women in scary situations. Her books contain no sex and no serious violence; they are all about nice people threatened by the darkness out there, and many female readers loved her work, including me.

But she is now 79 and has been collaborating for some years with her daughter Carol, who has none of her talent. This is a holiday mystery at sea', in which a group of respectable Americans, plus some crooks, set forth on a post-Christmas cruise that goes horribly wrong. It's ridiculous and unreadable.