Dominion (Futuristic Four)
This is Book 2 (after Futuristic Four)
It's been four years. Hiro's graduating from college. He doesn't believe he's ever going to hear from Violet, Penny, or Wilbur again. If they wanted to talk, they would have done it already.
That's before Penny sends the important message: Violet is missing and hasn't been heard from in days.
Reunited with a common goal as teenagers they travel through time in search of their friend. But instead of traveling forward or back they travel sideways, into another dimension where death is lurking and some are not so quick to forgive. A dimension they might not even want to come from from.