In the title compound, C(23)H(22)ClN(3)O, the benzene ring of the 4-chorobenzyl group makes a dihedral angle of 78.56 (6)° with the best plane of the indole ring. The double bond connecting the aza-bicyclic and indole groups adopts a Z geometry. The geometry adopted by the C=N bond with respect to the N-OH bond is trans. The absolute configuration of the compound was determined from refinement of the Flack parameter.