This feature-length drama tells the moving story of a British family's fight to discover what happened to their son Tom, a 21-year-old photography student fatally wounded by an Israeli Defence Forces sniper while attempting to rescue a group of terrified Palestinian children, whom he believed to be coming under Israeli fire. At the heart of the Hurndall family's campaign lies an emotional story of enormous courage, grief and guilt. In their search for the facts about their son's shooting, they took on the state's most powerful institution: the Israeli Defence Forces (IDF); and in doing so found themselves caught up in one of the world's most complex and intractable conflicts. Speaking of guns... Panorama (8.30pm, BBC1) is examining the Sarah Palin effect on the US presidential campaign, and contrasting Barack Obama's district of Chicago with the battleground state of Ohio amid the global money crisis.