Pattern — K.J. Parker

In a world he does not know, Poldarn's future is uncertain. Pursued by invisible enemies and haunted by the demons of his past, nobody can be trusted-not even himself, it seems. Attempting to piece together his own life from whatever scattered fragments he can find and dreams that hide as much as they reveal has brought him nothing but trouble. Now all he craves is peace. But will he find it on the island he believes to be his childhood home? Or will this place hold more terrors for him to confront?