Using Awk

I am trying to write an awk script to identify and edit (sub) a set of lines embedded in a file. The lines are identified by the first one starting with a "[" and the last one ending with a "]". I want to remove the line feeds (carriage returns) from the identified lines. The documentation on awk generally implies it accepts \n in regular expressions, but I don't seem to be able to get a match using either \n or \r, much less get a substitution. It's been a long time since I have used awk, but I believe I have done this sort of thing with it before. Sed is not helpful in the same way.