First up is the top-secret scanning device that will stop terrorist attempts to smuggle liquid bombs and guns on to passenger jets. Next, Mack takes command of the newest rapid-fire naval gun as he tries to take out waterborne suicide bombers. Back on land, he wields the very latest security detail carbine when he goes head to head with the Roswell SWAT Team during an exercise to protect a VIP from assassins. Then he gets to test the newest remote-controlled weapons station for armoured personnel carriers.

A young boy, Oskar, is trying to cope with the loss of his father. His father was a jeweler working on the 105th floor of the World Trade Center in New York city. He is at work on the tragic day of September 11, 2001 when the twin towers collapse. Oskar hears his father's final answer machine messages, left on that fateful day, which he conceals from his mother. A year later, he discovers a key in his father's belongings and, as he used to do with his father, embarks on a scavenger hunt to find the matching lock. He meets lots of people along the way and documents his journey in a scrapbook.