I enjoyed this fast-moving serial-killer mystery about a real rogue's gallery of murderers.

 This book contains portraits of ten or twelve habitual killers, from the trucker who likes to break the neck of hitchhikers to the butcher who doesn't distinguish between cow's blood and human blood when he's cutting up slabs of meat. The author, Dani Amore, has a way with words.
What is totally original about The Killing League is the premise that one Sick Dude decides to gather together this rogue's gallery of murderers in a competition. See who's really king of the heap in the art of slitting throats or sticking people with syringes loaded with fast-acting poison.
The heroine of the book is the highly likeable and athletic Nicole Candela, a woman who was brutally attacked three years ago. Without her ex-FBI friend Wallace Mack, who saved her in the nick of time, it would've been all over. How these two characters fit in with the death spiral in the killing league gets to the heart of this book.
The writing is streamlined; the chapters short, the sentences clean, the dialogue punchy. I read Death by Sarcasm by the same author a few months ago, and her short story Scales of Justice was equally hilarious. Having now read The Killing League, I know I'll be back for another Dani Amore book before long.