31 books • 6 series
Book #1: Pulverfass
Book #2: Auslöser - Flashpoint
Book #3: Feuersturm
Book #1: Concrete Evidence
Book #2: Body of Evidence
Book #3: Withholding Evidence
Book #4: Incriminating Evidence
Book #5: Covert Evidence
Book #1: Into the Storm
Book #3: Don't Look Back
Book #1: Dangerous Ground
Book #2: Crash Site
Book #1: Tinderbox
Book #2: Catalyst
Book #3: Firestorm
Book #4: Inferno