Maybe this is a spoiler alert, but by the end of “A Kid From Coney Island,” the kid seems grown up, and at peace, neither of which one could see coming for much of the film.
Such is the journey of Stephon Marbury, one-time Brooklyn basketball wunderkind and later a mercurial Knick, who in a decade playing in China reinvented himself and his outlook.
The documentary about him, which premiered at the Tribeca Film Festival last month and still is in search of a distribution deal, chronicles it all through extensive archival video and interviews with relatives and friends.