With a sharp scalpel and some sticky tape and a bit of care you can join the tape together again - try not to get a twist in it and expect there to be a noticeable "jump" in the recorded output.
If the tape contains digital files - the file where the break happened will be unreadable - if it's analogue sound or video then you will probably get away with it.
If you want to take it somewhere rather than do it yourself then begin with the Yellow Pages for your Town/Country
Good luck...
Peccavi, January 2013
