Ever since Greenberg's 1963 classification of Niger-Congo -- the largest of Africa's four language families -- the relationship between the Kwa and Benue-Congo branches has remained puzzling to historical linguists. By contrast, the past decade has seen emerging consensus on several aspects of the grammatical typology of the Benue-Kwa area. The twelve papers explore the unity and diversity of Benue-Kwa by investigating issues in the syntax of objects: verb serialization, verb extensions, light verbs, object agreement, object shift and double objects. Half of the contributors speak the languages they study; most work in the principles-and-parameters tradition of generative grammar, including very recent perspectives of minimalism and antisymmetry. All the papers suggest innovations in these theories to accommodate African data, much of which appears here for the first time.