Dana is in love...again, with Mac, a gorgeous boy in town. Shelley and Faith are happy for Dana, at least at first, but there's something a little odd about Mac. Why doesn't he ever remember Dana's friends after he meets them? Why does he forget where he and Dana are supposed to go on a date? Is he just very absent-minded?
One night, when Faith and Shelley see Mac with Pamela, when he's supposed to be with Dana, they start to wonder. Mac seems to be a boy with a secret, and the roommates want to find out what it is. When they do, Dana is in for the biggest surprise of her life...
"Emily Chase" was the pen-name used by a number of authors who contributed to Scholastic's Girls of Canby Hall series, about a group of girls living at a New England boarding school. Amongst these contributors was romance novelist Julie Garwood.
Faith is applying for a summer internship at a newspaper. A bratty three-year-old hurts a dog with a collar. There's going to be a costume party and all three girls are going to dress as similar clowns. Meanwhile, Dana has fallen for a guy named Mac, but he acts strange at times and can go missing for twenty minutes during a date.
Dana finally realizes that there are two Macs. Faith is going to help find out what is going on by taking photos of the two, and Shelley will also help out in discovering just what is going on. It gets strange enough that they end up referring to the two boys as Mac1 and Mac2. The girls approach the problem by making use of the scientific method and the evidence begins to pile up. They end up finding out just what has been going on. A rather interesting mystery-type story.