Watch Harriet the Spy (1996) HD Full Movie Free on SolarMovie. Watch Harriet the Spy (1996) online free. Harriet M. Welsch is a spy. But when her friends find her secret notebook, the tables are turned on ...Harriet M. Welsch is a spy. But when her friends find her secret notebook, the tables are turned on her. Can she win them back and still keep on going with the spy business?