A She Code Rule: Protect your friends from other people who will surely ruin their lives.

Lori, the new girl at college, has always been easygoing and fun, so when she moves in with "Girl Perfect" and her protective minion, Dena, she expects to have the best year of her life with them. But Dena is bent on keeping her BFF all to herself and at arm's length from their new roomie—even if it means baring her claws and undermining Lori at every turn.

We've all had roommates from hell, haven't we?