In the title compound, C(14)H(11)NOS, the thia-zine ring adopts a slightly distorted boat conformation. The dihedral angle between the mean planes of the two benzene rings is 20.2 (9)°. An inter-molecular N-H⋯O hydrogen bond and a weak C-H⋯π inter-action occur in the crystal, creating a two-dimensional network parallel to the bc plane.