Join 12-year-old secret agent Zac Power on another incredible mission!Armed with the latest high-tech gadgets and his wits, Zac Power can take on anything the world throws at him. Whether he’s foiling Dr Drastic’s latest evil scheme or taking out the trash, Zac can do it all with time to spare.Zac Power has entertained kids worldwide for almost twenty years, and is soon to star in his very own major motion picture! Zac’s on his most extreme mission ever! When Zac Power’s grandpa drags him on a new mission in the middle of the night, Zac is pumped. They’re racing to find the four parts of a powerful gadget called IRIS. But Grandpa won’t say what IRIS does, or why it’s been broken up. The only thing Zac knows is that this time, the threat is bigger than to just G.I.B. If they don’t find IRIS before their enemies do, the whole world will be in danger…In Zac Power Extreme Mission #2: Dark Tower, the second piece of the evil IRIS is hidden deep in a dangerous forest. Zac has to battle an army of androids, but there are more surprises in store…Read all four interlinked Extreme Missions! Zac Power Extreme Mission #1: Sandstorm Zac Power Extreme Mission #2: Dark Tower Zac Power Extreme Mission #3: Ice Patrol Zac Power Extreme Mission #4: Water Blaster