  We report specific heat measurements on a high quality single crystal of the
heavy-fermion compound CePt$_2$In$_7$ in magnetic fields up to 27 T. The
zero-field specific heat data above the N\'{e}el temperature, $T_N$, suggest a
moderately enhanced value of the electronic specific heat coefficient $\gamma =
180 \; \rm{mJ/K^2mol}$. For $T<T_N$, the data at zero applied magnetic field
are consistent with the existence of an anisotropic spin-density wave opening a
gap on almost entire Fermi surface, suggesting extreme two-dimensional
electronic and magnetic structures for CePt$_2$In$_7$. $T_N$ is monotonically
suppressed by magnetic field applied along the $c$-axis. When field is applied
parallel to the $a$-axis, $T_N$ first increases at low field up to about 10 T
and then decreases monotonically at higher field. Magnetic phase diagram based
on specific heat measurements suggests that a field-induced quantum critical
point is likely to occur slightly below 60 T for both principal orientations of
the magnetic field.
