A figure moved silently in the darkness of the jungle clearing…then another – and moments later two sentries fell unconscious without a sound. Swiftly the intruders stepped over the inert bodies and through the door of the now unguarded hut. But these attackers wore the same uniform as the sentries and they were in the same army. What on earth was going on?

Believe it or not, it all started when the night express to Glasgow crashed in November 1922…