Life and death.

Right and wrong.

It's a very fine line between both, as the doctors of Grey's Anatomy know, and next week, it looks like we'll see them toe those lines once again. Let's hope tragedy doesn't strike Meredith ...

What we do know from the synopsis is that Derek and April work around the clock to find a solution for the hospital, and Cristina struggles to respect the wishes of a family whose son is dying.

Meanwhile, Arizona empathizes with a teenager who faces problems similar to her own.

For a full rundown of last night's "Walking on a Dream," follow the link to read our official Grey's Anatomy review. Then check out the first promo for "Bad Blood" and comment below:

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.