This is where it all started. A Victorian inventor by the name of Dr Nebo, created a time machine with catastrophic results. In attempting to use it, he inadvertantly split reality into three parallel ones. We, of course, exist in this one, and in another there are people very similar to us, but not quite the same.
We are currently under threat from this other reality, as the powers that be wish to rule all three, and are attempting to bind them together again. Should that happen, we would cease to exist.
Fortunately, we have an agent - Margo (code-named Bluebirds) - who has gone to this parallel world to prevent our demise. She is trying to get in touch with a rebel group there, and needs our help.
The rebel group have left a number of clues around Bristol of how to contact them, and it is our mission to discover them and work out the riddles. If Margo gets the info in time, she will meet up with the rebels and save us all!