Agile development approaches, such as Scrum, continue to gain importance in today's world. Since previous research has predominantly treated development approaches as a black box, we answer the call for empirical research concerning adoption of agile methods. The study's aim is to assess the adoption or adaption of Scrum principles at an e-commerce company. The findings of our in-depth single case study reveal that not all Scrum principles are suitable in each context. By discussing the reasons for adopting or adapting the principles, we contribute to a deeper understanding of agile methods and help to open the black box of development approaches in information systems research. The in-depth insights gained at our case company provide practitioners a useful reference for adapting agile methods to their specific contexts.