  Mirror symmetry has proven to be a powerful tool to study several properties
of higher dimensional superconformal field theories upon compactification to
three dimensions. We propose a quiver description for the mirror theories of
the circle reduction of twisted $A_{2N}$ theories of class $\mathsf{S}$ in four
dimensions. Although these quivers bear a resemblance to the star-shaped
quivers previously studied in the literature, they contain unitary, symplectic
and special orthogonal gauge groups, along with hypermultiplets in the
fundamental representation. The vacuum moduli spaces of these quiver theories
are studied in detail. The Coulomb branch Hilbert series of the mirror theory
can be matched with that of the Higgs branch of the corresponding four
dimensional theory, providing a non-trivial check of our proposal. Moreover
various deformations by mass and Fayet-Iliopoulos terms of such quiver theories
are investigated. The fact that several of them flow to expected theories also
gives another strong support for the proposal. Utilising the mirror quiver
description, we discover a new supersymmetry enhancement renormalisation group
flow.
