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The plane-wave limit of ${\rm AdS}_3 \times {\rm S}^3 \times {\rm S}^3 \times{\rm S}^1$ is analysed for generic null-geodesics that are not necessarily BPS.For the case of pure NS-NS flux it is shown how the resulting spectrum can bereproduced as a suitable limit of the world-sheet description in terms of WZWmodels. Since supersymmetry is broken, most of the degeneracies are lifted, andthus the identification of states is quite unambiguous.

The plane-wave limit of ${\rm AdS}_3 \times {\rm S}^3 \times {\rm S}^3 \times {\rm S}^1$