Kill Zone — Loren D. Estleman

A remarkable new antihero, mob hit man Peter Macklin must end a hostage crisis on a tour boat in Lake Erie
 
Siegfried, a terrorist group made up of a killer, a bassist, an ex-marine, a demolitions expert, a Black Panther, a national guardsman, and a couple of spoiled teenagers, is about to become Detroit's worst nightmare. The motley gang boards a river cruise boat armed with M16s and enough explosives to burn the city down. They have eight hundred hostages, and if they don't get what they want, Siegfried will kill every soul aboard.
 
Rescue is impossible. No cop could get on the boat. The only man with the skills for the job is Peter Macklin, a professional killer with ties to the local mob. Hired by the FBI bureau chief to sneak aboard the ship and destroy Siegfried from the inside out, Macklin will find killers in front of him -- and another on his tail.
 
Set in Detroit, this fast-paced thriller introduces another great series from the three-time Shamus Awardâ€"winning author of the Amos Walker Mysteries.
 
Kill Zone is the 1st book in the Peter Macklin Thrillers, but you may enjoy reading the series in any order.