This chapter book based on PBS's popular TV show Martha Speaks features two back-to-school stories, plus a glossary and activities. In the first story, T. D. adds Martha's nameto the substitute teacherlist at Wagstaff Elementary, but not even he expects a talking dog to actually fill in for Mrs. Clusky. Never one to ignore the call of duty, Martha takes the class under her wing er, paw but Helen's not sure their friendship cansurvive Martha's strict...