Sam Green's life is in danger of imploding. Suffering from post-traumatic stress disorder after horrific injuries and personal tragedy in Afghanistan, she escapes to The Isle of Mull hoping to convalesce. A chance find on the island's shores interrupts her rehabilitation and launches her on a journey to West Africa and on a collision course with forces and adversaries she cannot begin to comprehend. Meanwhile in London, MI6 is facing down a biological threat that could kill thousands and inflame an already smouldering religious war. Time is not on anyone's side and Sam's determination to face her past and control her future regardless of the risks looks likely to end in disaster. Fate conspires to bring Sam into the centre of an international conspiracy where she alone has the power to influence world changing events. Blind to her new-found role, is her military training and complete disregard for her own safety enough to prevent the imminent devastation?