30 books • 2 series
Book #1: Operator 5 #1
Book #2: Operator 5 #2
Book #3: Operator 5 #3
Book #4: Operator 5 #4
Book #5: Operator 5 #5
Book #21: Operator 5 #21
Book #22: Operator 5 #22
Book #24: Operator 5 #24
Book #25: Operator 5 #25
Book #26: Operator 5 #26