The Impostor by Damon Galgut

When Adam moves into the abandoned house on the dusty edge of town, he is hoping to recover from the loss of his job and his home in the city. But when he meets Canning -- a shadowy figure from his childhood -- and Canning's enigmatic and beautiful wife, a sinister new chapter in his life begins. Canning has inherited a vast fortune and a giant folly in the veld, a magical place of fantasy and dreams that seduces Adam and transforms him absolutely, violently -- and perhaps forever.