  Non-leptonic $B^0_s \rightarrow D_s^{\pm} K^{\mp}$ transitions are
particularly interesting processes to test the Standard Model. As these decays
occur via pure tree diagrams, they allow a theoretically clean determination of
the angle $\gamma$ of the unitarity triangle. Considering recent LHCb results,
an intriguing picture arises, showing tension with the Standard Model.
Extracting the branching ratios of the underlying $\bar{B}^0_s \rightarrow
D_s^{\pm} K^{\mp}$ modes and combining them with information from semileptonic
$B_{(s)}$ decays, we arrive at another puzzling situation, in accordance with
similar decays. These patterns could be footprints of New Physics. We present a
model-independent strategy to include such New-Physics effects and apply it to
the data. Interestingly, new contributions of moderate size could accommodate
the data. This formalism offers an exciting probe for new sources of CP
violation at the future high-precision B physics era.
