  We present new families of $AdS_5$ solutions in M-theory preserving 4d
${\mathcal N = 2}$ supersymmetry. We perform a systematic analysis of
holographic observables for these solutions, providing evidence for an
interpretation in terms of 4d superconformal field theories (SCFTs) of
Argyres-Douglas type, realized in class $\mathcal S$ via a sphere with one
irregular, and one regular puncture. The gravity solutions exhibit internal
M5-brane sources that correspond to the irregular puncture. For a family of
solutions, we identify explicitly the class $\mathcal S$ puncture data and
perform a detailed match, including Higgs branch operators. For other families
we comment on proposed field theory duals, based on irregular punctures labeled
by nested Young tableaux.
