When an F4 tornado strikes the hospital, nothing will ever be the same for the two of them again.

Despite Dr. Allen Jacobson rescuing her, ER nurse Izzie MacNamara doesn't trust him one bit. He is too arrogant, too charming—and too many nurses have fallen for him before. She has other things to focus on—like getting her life back to normal. And standing on her own two feet again.

Events in the last year have changed Allen in ways he is still trying to identify. But there is one woman who doesn't tiptoe around him at the hospital now. Allen needs that.

When someone nearly kills her, Allen is there to protect her once again. Allen will always be there when Izzie needs him—and he will always protect her, no matter what the cost. That's a promise he makes himself—and intends to keep.

But danger is getting closer and closer; if Allen fails, Izzie's going to be a victim once again.