  We explore signatures related to squark decays in the framework of
non-minimally flavour-violating Supersymmetry. We consider a simplified model
where the lightest squark consists of an admixture of charm and top flavour. By
recasting the existing LHC searches for top and charm squarks, we show that the
limits on squark masses from these analyses are significantly weakened when the
top-charm mixing is sizeable. We propose a dedicated search for squarks based
on the $tc+{E_{\mathrm{T}}^{\mathrm{miss}}}$ final state which enhances the
experimental sensitivity for the case of high mixing, and we map its expected
reach for the forthcoming runs of the LHC. We emphasize the role of analyses
requiring a jet tagged as produced by the fragmentation of a charm quark in
understanding the squark mixing pattern, thus providing a novel handle on new
physics. Our results show that, in order to achieve full coverage of the
parameter space of supersymmetric models, it is necessary to extend current
experimental search programmes with analyses specifically targeting the cases
where the lightest top-partner is a mixed state.
