This article examines the syntactic properties of a long-distanceagreement construction in Innu-aimûn (Algonquian)in which a matrix verb may agree with an argument in its complement clause, normally with an associated topic interpretation for the DP target of agreement. It is shown that this is true cross-clausal agreement into a finite complement, rather than agreement with a prothetic object or exceptional Case marking. The topic interpretation effect is shown to reflect a (covert) Ā-movement that produces a complement clause with an accessible target for agreement at the left periphery.