The criminal justice system has long been delineated along juvenile and adult lines. The ostensible rationale for this separation was that juveniles are developmentally distinct from adults; they require less punitive, more rehabilitative treatment than adults in order to improve their behavior. The underlying assumption is that adults are fully mature, and so developmental programs will be ineffective for them. However, recent research has indicated that young or emerging adults are not fully mature, either socially or physiologically. This has led for some to call for a new, “third way” approach for young adult offenders. We describe a program in Maine designed for young adult offenders, in which inmates are separated from both juveniles and adults and provided a diverse array of programming.