Jack Kelly and Paul Mann are like brothers; the two old wartime enemies have been through blood and fire and must now face their greatest challenge. When the Japanese threaten to invade the Pacific they know that they must do everything in their power to protect their country, and their loved ones, from an ambitious and merciless enemy.

Their sons, Lukas Kelly and Karl Mann, have inherited their fathers' brave and passionate natures, and are determined to do their part to support the Australian cause-romantic entanglements for the two young men raise the stakes even further.

Four incredible men, with ties closer than blood, fight to hold on to love, friendship and a world that is gradually disappearing.