  Theories which contain ghost fields are considered to be invalid. It is
assumed that for such theories the energy is unbounded from below, and the
theory will be unstable, allowing the creation of particle pairs with
arbitrarily large positive and negative energies. Such ghost fields are a
serious problem for theories of massive gravity.
  We present here an example of such a theory of gravity with a ghost field
which avoids this problem. While its equations are locally equivalent to those
of a theory of massive gravity with a ghost field, global restrictions of the
configuration space have the result that the ghost mode has to remain small,
and the energy has to remain positive.
  As a consequence, the existence of a ghost-like mode in the equations of the
theory is not a decisive argument against this theory.
