The story completion method is a form of narrative inquiry that involves inviting research participants to complete a narrative from a supplied story opening, or “stem.” In this case study, I outline the history and development of the method and provide details of my innovative use of story completion in a study on the topic of how people seek and use information when faced with a health problem. My use of story completion builds on my interest in using creative methods for social inquiry, including those involving the generation of fiction, narrative, and poetry. My development of the method is innovative in incorporating more-than-human theory. In my study, I was interested in investigating how the participants incorporated human and nonhuman agents in their narratives and how they described the relationships between these agents. I provide details of how I undertook my story completion project and how I analyzed the narratives generated by the storytellers with the use of concepts I derived from more-than-human theory, including affordances, affective forces, relational connections, and agential capacities. The case study ends with outlining possibilities for future developments in the story completion method.