Interception
A scientist who has invented an instantaneous form of transport is fleeing from a totalitarian government and seeks refuge on Voyager. He decides he cannot risk the technology to fall into his government's hands as they would only use it to tighten the grip on their subjects even more, but neither does he want his life's work to be lost so he sends his logs into deep space in a very small untraceable probe, the whereabouts of which he stores deep inside Voyager's computer. Part of the protection is that the computer has the information but doesn't 'know' that it knows where the shuttle is.
The Voyager crew decides they must have this information and therefore they need to intercept this probe. However, the only way to possibly obtain its coordinates it is to make the computer 'dream', in which case the information contained into the computer's 'unconscious' might come to the surface in some form of symbols. So they rig the holodeck to show the computer's 'dreams' (like in Phantasms), and enter.
Turns out the 'dream' isn't deep enough for the information to be revealed, so they create a dream inside the dream and enter that one. Same result so they create a third level. And a fourth, and so on. At some point they lose count of how many levels they're in, which is dangerous because it also means they cannot be sure they truly are out of the holodeck again once they ascend the stairs again. Also, the deeper they go, the slower the 'dreams' begin to run, because even the computer hardware has its limits having to run so many nested levels, which is annoying as heck.
Will they recognise the information once they come accross it? And more importantly, once they intercept the shuttle and build the transportation device and they go home, can they be sure they're not still within one of those dreams?
Next episode: A Bridge Too Farr