This is an attempt to articulate and explore the relationship between the science of memory and the applied theatre project, "The Not Knowns." The project was a collaboration between theatre practitioners and a psychologist who worked together with a group of young people known, problematically, as the "not knowns" throughout 2014. For applied theatre practitioners, notions of veracity are crucial, if complex, and go far beyond the practice of "giving voice" to marginalised groups and people. Applied Theatre projects which work with participant autobiographies take on the responsibility of articulating the perspective as one of many possible truths, observing conventions which sustain a truth claim, but leaving this open for questioning. In this essay, the project collaborators examine the implications of the notion of memory as adaptable and malleable, as a factor in stasis or change, and as a story that may and must be re-told and re-remembered in an act of self-sustaining performativity.