They were all crossing lines in their search for answers. Peta Shepherd had already crossed the line. Archie Conn might know why, and Harry Roberts would cross lines to find him. Emily Freeman had crossed a line, leaving the US and moving to London to be with Len Stone, Peta's friend, Archie's nemesis. Her head was full of secrets; why was she leaving? Colonel Skinner would cross lines to discover why, and to keep the Brits off his back...