This study investigates the previously neglected literary phenomenon of game novels, a genre that is part of the increasing significance that games are having in culture. Intermedial studies is one of the principal fields that examines these types of phenomena, which provides perspectives for understanding the interactions between media. Furthermore, it forms the foundation for this study that analyses the relation between the four novels by Drew Karpyshyn (Mass Effect: Revelation, 2007; Mass Effect: Ascension, 2008; Mass Effect: Retribution, 2010) and William C. Dietz (Mass Effect: Deception, 2012), and the Mass Effect Trilogy. Differences and similarities between the media are delineated using semiotic theories, primarily the concepts of modalities of media and transfers of media characteristics. The thesis further investigates the narrative discourse, and narrative perspectives in the novels and how these instances relate to the transferred characteristics of Mass Effect. Ultimately, the commonly transferred characteristic in the novels is the storyworld, which reveals both differences and similarities between the media. Regardless of any differences, the similarities demonstrate a relationship where the novels expand the storyworld.