Hell Is Always Today — Harry Patterson

When the body of a young woman … the fifth to die in as many weeks … is found in a rain-soaked alley, the city is gripped with mortal fear. A mad killer known as the Rainlover walks among them, and no one, not even the police, know when he will strike again.
But Detective Sergeant Dick Miller has more than the Rainlover on his mind … the boxer-turned-expert-cat-burglar Gunner Sean Doyle. He's busted out of prison, and Nick wants to put him back behind bars in the worst way. What neither of them knows is that each of their fates will be decided high above the streets, with cop and convict facing down their most daunted challenges the only way they know how…