A private island. A ruthless Yakuza boss. An old enemy with the mother of all debts to settle.Scorpion, Japan’s most dangerous and unpredictable Yakuza boss, has a plan. He wants to destroy the ECHO team members in the most depraved and painful ways imaginable and he intends to enjoy their demise to the full.Joe Hawke and his unrivalled team must fly into hell itself to rescue their friends from Scorpion’s insane designs, but doing so will endanger all their lives. After confronting an army of ninjas, they are faced with the world’s most deranged murderers and serial killers, gathered together on Scorpion Island by the Yakuza boss with the sole purpose of killing ECHO one by one. Fighting harder than ever before, the team’s efforts are rewarded by a shocking revelation concerning Scorpion’s plans for the United States.Meanwhile, on the other side of the world, ECHO's oldest enemy is gathering for a new mission with a truly horrific vision for humanity at the centre of its black heart.