Maggie, Dan's changeling girlfriend, languishes in a fairy prison. The witch Sister knows Maggie's Truename and plans to use it to enslave her. And Dan? Dan and his friends Alice and Josh have passed through a gate to the world of Inland--a gate stranding them in a thick tropical jungle where voices whisper in the night, and every morning brings strange footprints, always moving away from Dan and his friends. Dan must battle goblins, Sister, and his own doubts, striving to reach Maggie before Sister does. But even if he and Maggie reunite, Sister still possesses Maggie's Truename. Can he overcome these terrible obstacles to save her? In Marrowland, the fourth installment of the Gates of Inland series, Dan and Maggie will be forced to make a decision that will test their commitment--to Dan's quest and to each other.