This case presents a scenario where Madrigal, a U.S. retailer with a rich 20-year history and a solid loyalty program, faces a turning point with the arrival of a new CEO. This leadership change reveals a critical gap in understanding the customer base, prompting an urgent audit of historical purchase data to assess customer growth patterns. Students are tasked as the CMO to analyze four years of transactional data, addressing questions on customer value, characteristics, and segmentation. The case study emphasizes the importance of a thorough customer-base audit to develop strategies for sustainable growth, serving as a practical learning tool for evaluating any company's customer base health.