  We define the twisted Blanchfield pairing of a symmetric triad of chain
complexes over a group ring Z[G], together with a unitary representation of G
over an Ore domain with involution.
  We prove that the pairing is sesquilinear, and we prove that it is hermitian
and nonsingular under certain extra conditions. A twisted Blanchfield pairing
is then associated to a 3-manifold together with a decomposition of its
boundary into two pieces and a unitary representation of its fundamental group.
