From Dramatists Play Service:
When Elwood P. Dowd starts to introduce his imaginary friend, Harvey, a six-and-a-half-foot rabbit,
to guests at a society party, his sister, Veta, has seen as much of his eccentric behavior as she
can tolerate. She decides to have him committed to a sanitarium to spare her daughter, Myrtle Mae,
and their family from future embarrassment. Problems arise, however, when Veta herself is
mistakenly assumed to be on the verge of lunacy when she explains to doctors that years of living
with Elwood's hallucination have caused her to see Harvey also! The doctors commit Veta instead of
Elwood, but when the truth comes out, the search is on for Elwood and his invisible companion. When
he shows up at the sanitarium looking for his lost friend Harvey, it seems that the mild-mannered
Elwood's delusion has had a strange influence on more than one of the doctors. Only at the end does
Veta realize that maybe Harvey isn't so bad after all.
For more information about Harvey, click here.