Bloodbath (A Soldier of Fortune Adventure #10‪)‬

Rainey had flown to Hawaii for some much-needed R and R. Instead, he landed right in the middle of a Beirut-type blowout. A terrorist group had sent an ambulance packed with high explosives hurtling into a children’s hospital. Their aim: Hawaiian independence. The result: hundreds of dead and maimed children.
The local police told Rainey to find the butchers or face the charges himself.
So Rainey went to work.