The diagnosis of an advanced cancer in young adulthood can bring one's life to an abrupt halt, calling attention to the present moment and creating anguish about an uncertain future. There is seldom time or physical stamina to focus on forward-thinking, social roles, relationships, or dreams. As a result, young adults (YAs) with advanced cancer frequently encounter existential distress, despair, and question the purpose of their life. We sought to investigate the meaning and function of hope throughout YAs' disease trajectory; to discern the psychosocial processes YAs employ to engage hope; and to develop a substantive theory of hope of YAs diagnosed with advanced cancer. Thirteen YAs (ages 23-38) diagnosed with a stage III or IV cancer were recruited throughout the eastern and southeastern United States. Participants completed one semi-structured interview in-person, by phone, or Skype, that incorporated an original timeline instrument assessing fluctuations in hope and an online socio-demographic survey. Glaser's grounded theory methodology informed constant comparative methods of data collection, analysis, and interpretation. Findings from this study informed the development of the novel contingent hope theoretical framework, which describes the pattern of psychosocial behaviors YAs with advanced cancer employ to reconcile identities and strive for a life of meaning. The ability to cultivate the necessary agency and pathways to reconcile identities became contingent on the YAs' participation in each of the psychosocial processes of the contingent hope theoretical framework: navigating uncertainty, feeling broken, disorienting grief, finding bearings, and identity reconciliation. Study findings portray the influential role of hope in motivating YAs with advanced cancer through disorienting grief toward an integrated sense of self that marries cherished aspects of multiple identities. The contingent hope theoretical framework details psychosocial behaviors to inform assessments and interventions fostering hope and identity reconciliation.