In Austin in 1998, sixteen-year-old Nathaniel Rothstein finds confidence and belonging at a boxing gym under the mentorship of former fighter David Dalice, only to disappear without a trace. Running alongside his story is that of Charles Rex, known as “X,” a teenager searching for intimacy and acceptance while struggling with his identity. More than a decade later, Nathaniel’s uncle reopens the case, uncovering a web of interconnected lives from the boxing world and beyond that reshape what is known about Nathaniel’s disappearance.