"What's Your Number" is a historical drama about the unlikely friendship between a Holocaust survivor and and African-American boy. The two meet at the park when the boy's mother is late picking him up due to a traffic accident with a racist truck driver. The survivor stays with the boy at the park until the mother comes to pick him up. During those four hours, the survivor shares with the boy his survival story from the concentration camp. At this moment, we go to a flashback and see how on the last day of the war, the survivor's sister saved them both.