Through Time Series: Boxed set

Picking up where the Legend series leaves off, the Through Time Series
pits humans and Seelie Fae against the machinations of the Dark Princes.
Fueled by a desire for revenge and a thirst for power, the Dark Princes
have discovered how to use time itself to achieve their goals, and no
realm—human, Milesian, or Fae—is safe. Contains all five books in the
series.