Leap Second. The Chivalrous Welshman, #6

The camp is destroyed, thousands of acres burned to the ground, and all but one person is accounted for. When Tommen wakes up in a forest of ash, he makes a startling discovery-well, more startling than being cold, along, injured, infected, and concussed. He's invisible and incorporeal. Somehow, in the chaos of the fire, he was thrown into the Land In Between, from which no one has ever returned. Worse, Time does not work in the Land In Between, meaning he is also powerless to heal himself or escape.
With no way to communicate with the corporeal world, Tommen must find an exit from within the dimension. But there is more to this fabled hell than meets the eye, and time travel is only the beginning. When he meets the self-proclaimed mistress and curator of the Land In Between, she agrees to teach him the way to escape, but only if he agrees to take her with him. Time is short as Tommen's infections worsen, and his dad is not the only one waiting for him on the other side.