The Cold Dark

From publisher blurb:

It has been a little over two days since our balloon wrecked in this cold, dark place. We are somewhere below the floating island the doctor was all excited about seeing. He’s been missing for days now, fallen from the balloon in a storm in the dark, and since the boys are out foraging for food, leaving me, Connor, and Jenna to hide in the shelter of this cave, I appear to have nothing better to do then to keep up the good Doctor’s Journals. Perhaps, when we find him, he can pen in the things he’s missed writing over, and he does so seem to enjoy writing in this journal.. I think it brings him comfort, a piece of science in this strange place. Perhaps I should start back at the beginning.