What encoding should I use to read a line from a file?

I am parsing a file (which I am not creating) that contains a string. The line is always preceded by 2 bytes, which tell me the length of the next line.

For instance:

05 00 53 70 6F 72 74

:

Sport

Using C # BinaryReader, I read the line using:

string s = new string(binaryReader.ReadChars(size));

Sometimes a weird funky character appears that seems to push the flow position further than it should. For instance:

0D 00 63 6F 6F 6B 20 E2 80 94 20 62 6F 6F 6B

Must be:

cook - book

and although it reads fine, the stream ends two bytes further than it should ?! (Which then messes up the rest of the parsing.)

I guess this has something to do with 0xE2 in the middle, but I'm not quite sure why and how to deal with it.

Any suggestions that were highly appreciated!