“Your head. It’s got its own undertow, you know, and if you swim too deep, it can suck you down. You can’t chase the tide. You need to stay on the shore and let it come to you.” She shook her head. “I’m not going to tell you that everything is going to be fine. I wouldn’t do it even if I was still allowed to lie. Some things are too cruel even for a sea witch. But I will tell you that what’s on the other side of that door is never going to be as bad as the undertow in your own mind.”