  In this work we have presented a special class of Kerr-Newman-NUT black hole,
having its horizon located precisely at $r=2M$, for $Q^{2}=l^{2}-a^{2}$, where
$M$, $l$, $a$ and $Q$ are respectively mass, NUT, rotation and electric charge
parameters of the black hole. Clearly this choice radically alters the causal
structure as there exists no Cauchy horizon indicating spacelike nature of the
singularity when it exists. On the other hand, there is no curvature
singularity for $l^2 > a^2$, however it may have conical singularities.
Furthermore there is no upper bound on specific rotation parameter $a/M$, which
could exceed unity without risking destruction of the horizon. To bring out
various discerning features of this special member of the Kerr-Newman-NUT
family, we study timelike and null geodesics in the equatorial as well as off
the equatorial plane, energy extraction through super-radiance and Penrose
process, thermodynamical properties and also the quasi-periodic oscillations.
It turns out that the black hole under study radiates less energy through the
super-radiant modes and Penrose process than the other black holes in this
family.
