More facts are needed from you, OP.
Was it (traditional) black and white film? c-41 developing at a 1hr photo will turn black and white negatives clear (bye pictures). This DOES happen.. some of the people working at these places either don't know the difference or don't care. They do make c-41 black and white film though and that you can have developed at a lab/1hr photo.
If the camera didn't expose the film it (negatives) will be clear as well, but the leader should be dark (where you loaded it). If the leader is clear and the negatives are clear - they goofed the developing up. This would also happen if you tried to have them develop traditional black and white film.
There is a chance it was loaded improperly as well, always make sure the winder knob (where you wind them film) is turning when you advance the film. If the shutter is broken (my Nikon FE shutter died) you will also have unexposed (clear) negatives.
Hope that info helps.