'The Troubles' are back, the North again becoming a horribly violent place, a dark return to the bad old days. The island of Ireland is once again torn in two, a hard border established between North and South following Britain's parting from the rest of Europe. Politicians are being targeted by a new terror group, a small and careful band of killers whose wish is to re-unite Ireland. Alex Green is a sergeant in the Special Air Service, part of Britain's...