There was a program on TV last night, "Selling Houses Abroad", which showed a couple who got ripped off in Montenegro. They bought off plan 3 yrs previously and when filmed had not yet gotten keys to the apartment. In fact, the land registry papers were never completed and somebody else was living in the apartment. When they eventually sorted it out (due I'm sure to the presence of TV cameras), they found that the apartment they had paid GBP 43,000 for was actually worth GBP 18,000. The builder had received GBP 18k, and the dodgy middle man got GBP 25k.
Avoid....