Simon James är en medioker men vänlig kontorsarbetare som drivs till vansinne när han upptäcker att han har en dubbelgångare.

Mouse-X is a mystery/sci-fi story about Anderson, a man who wakes in a building with no idea where he is or how he got there, before slowly discovering that in each of the rooms around him are a thousand clones of himself, all of whom woke into the same mysterious scenario. To escape he needs to outwit his 'selves' whilst overcoming the realization that he is not the only Anderson.