Fugue(2009)

When Jack loses his wife in a car accident his world falls apart. Unable to deal with the grief, he sinks into a dark obsession with the nature of death. Intrigued by a string of local murders, this bleak spiral leads him into obscure and forbidden realms of society that lie, barely concealed, beneath its surface. When he meets a woman who shares a similar pain, Jack is faced with the true nature of his obsession.