  The search for new physics with long-lived particles is an ongoing and
thriving effort in the High Energy Physics community which necessitates new
search strategies such as novel algorithms, novel detectors, etc...For these
reasons, one could perhaps add another frontier, the Lifetime Frontier, to the
standard three (Energy, Intensity and Cosmic). In this talk, I will describe a
BSM physics model whose characteristic signatures are decays of new (mirror)
fermions at displaced vertices, a domain belonging to the Lifetime Frontier. It
is a model of {\em non-sterile} right-handed neutrinos whose masses are
proportional to the electroweak scale $\Lambda_{EW} \sim 246 \, GeV$. The model
proposed a solution to the strong CP problem with a surprising connection
between the sizes of the neutrino masses and the $\theta$-angle which
contributes to the neutron electric dipole moment.
