Brennan Simkins was diagnosed with a rare subtype of leukemia on his seventh birthday. The next four years gave witness to one of the most improbable stories in the history of pediatric cancer. Unwilling to accept a hopelessly terminal diagnosis after his first relapse, his parents found the one research institution willing and capable of designing new treatment protocols and therapies to keep him alive until a cure could be identified. For the next four years, Brennan's determination of will inspired his doctors and transformed the hearts of all who witnessed it. This work is a chronicle of near tragedy, spiritual reconciliation, and redemption, presented through the perspective of a devoted father. Possibilities is a brave and true-life story of the fighting spirit of one little boy who overcame daunting medical odds while transforming the lives of others.