Hi kuanyin,
If it starts on episode 210 and ends on 250 as advertised... below is a very brief summary of episode 250..
Barnabas plans to make Maggie his bride, she pretends to be Josette. Maggie finds that Willie has made coffin intended for her. Maggie tries to stake Barnabas, but he rises from his coffin before she has the chance.
Hope this helps!