Where does Seq go when he wants to be alone in the novel, Where the Dead Sit Talking?

When Sequoyah spends time in the attic, it represents how he has come to value the experience of solitude. As a consequence of experiencing solitude with both Rosemary and Harold, Sequoyah realizes that there is part of him that both craves solitude and becomes more peaceful as a result of experiencing it. This discovery, and his time in the attic, are both stepping stones on his journey towards the place where, in the aftermath of Rosemary's death, he comes to feel most himself, and most comfortably solitary.