The book investigates the nature and properties of indirect objects and develops a typology of double object constructions on the basis of an examination of a variety of data within and across languages. It argues for a four-class division of double object constructions depending on (a) a type of case on the goal argument and (b) whether the goal is introduced by a zero applicative head or is an argument of the main verb. The central questions addressed revolve around locality, case and the structural representation of double object constructions.