While we are peacefully sleeping at our home, the Sainiks of our country are wide-awake to guard our borders and the security of our country even at the cost of their lives. Sainik is the film of one such brave soldier Suraj, who sacrificed his life for the sake his motherland, leaving behind an ailing father, a wife and a younger sister. The ailing father, the wife and the younger sister get this tragic news separately and under such compelling circumstances that prevent all of them from disclosing the tragedy to each other. How long where they able to hide the tragic news from each other? Where they able to disclose it or no?