  We study critical point finite-size effects in the case of the susceptibility
of a film in which interactions are characterized by a van der Waals-type power
law tail. The geometry is appropriate to a slab-like system with two bounding
surfaces. Boundary conditions are consistent with surfaces that both prefer the
same phase in the low temperature, or broken symmetry, state. We take into
account both interactions within the system and interactions between the
constituents of the system and the material surrounding it. Specific
predictions are made with respect to the behavior of a $^3$He and $^4$He films
in the vicinity of their respective liquid-vapor critical points.
