21 books • 3 series
Book #1: Junkyard Druid
Book #2: Graveyard Druid
Book #3: Moonlight Druid
Book #4: Underground Druid
Book #7: Druid Vengeance
Book #1: Invasion
Book #1: THEM Invasion
Book #3: THEM Counteraction
Book #4: THEM Gabby's Run
Book #5: Extinction