The famous teen detective, Nancy Drew, goes to Ireland to be maid of honor in her friend's wedding. This will not be the fairytale wedding that her friend hopes for, however. Shortly after Nancy arrives, the groom disappears. There are ghost sightings and strange things occurring, but Nancy has dealt with those before. Can she find the groom before it is too late? Is a more devious plot in the works, or is the Castle really haunted?

The 19th game in the Nancy Drew series, The Haunting of Castle Malloy contains all of the traditional elements of a mystery adventure game. It features a familiar point-and-click interface and is played in first person, putting you behind the eyes of Nancy. There are characters to question, puzzles to solve and various tasks to perform. Explore the Castle and its grounds, find important objects and clues. Nancy is sure to find out what's going on - with your help.