28 books • 5 series
Book #1: Hard Limit
Book #2: Hard Justice
Book #3: Hard Sin
Book #4: Hard Truth
Book #1: Scandalous
Book #2: Merciless
Book #3: Reckless
Book #4: Ruthless
Book #5: Fearless
Book #1: Thrust
Book #2: Rough
Book #3: Grind
Book #5: Callan