We present a new high-order front-tracking method for hyperbolic systems of
conservation laws for two gases separated by a tracked contact discontinuity, using a
combination of a high-order Godunov algorithm and level set methods. Our approach
discretizes the moving front and gas domains on a Cartesian grid, with control
volumes determined by the intersection of the grid with the front. In cut cells, a
combination of conservative and nonconservative finite volume quadratures provide
small-cell stability. Global conservation is maintained using redistribution. We
demonstrate second-order convergence in smooth flow and first-order convergence in
the presence of shocks.