The uninspired continuation, "The Secret of NIMH II: Timmy to the Rescue" ($15), clearly wasn't worth the wait.
For anyone who still remembers "The Secret of NIMH," "Timmy to the Rescue" starts where the original left off. Now the hyperintelligent laboratory rodents, who escaped from the sinister National Institute of Mental Health (NIMH), live in Thorn Valley, a utopian society. Timmy is the son of the deceased mouse hero, Jonathan Brisby. And the impulsive young mouse has been picked to rule Thorn Valley.
During his leadership training, Timmy meets a young girl mouse, Jenny, who tells him about the continuing horrors at NIMH. When Timmy learns that his brother Martin is imprisoned at NIMH, he and Jenny set out on a rescue mission. But a surprise awaits them -- Martin has been transformed into NIMH's maniacal ruler, and it's up to Timmy to set things right.