Think Services today announced that David Cage will give a keynote at Game Developers Conference Europe (GDC Europe). His speech, titled "Writing Interactive Narrative for a Mature Audience," will focus on the relevance, difficulties and strategies for making stories in mature games. Cage is CEO of Quantic Dream and has helped create Omikron: The Nomad Soul, Indigo Prophecy and the 2010 PS3 title Heavy Rain.