Kendra Sunderland Third Space Part 2 Extra Quality Now

I need to recall the main elements of the first book. There's a portal between modern times and a magical realm called the Third Space. The protagonist is Kendra. Maybe in part 2, the stakes are higher, like a threat to both worlds. Let me think about possible antagonists or challenges. Maybe a new enemy, or a betrayal? Also, alliances with other characters could be important.