What doesn't kill us / David Housewright.

Enhanced descriptions from Syndetics:

In David Housewright's next novel featuring the beloved Rushmore McKenzie What Doesn't Kill Us --McKenzie has been shot and lies in a coma while the police and his friends desperately try to find out what he was doing and who tried to kill him.

Rushmore McKenzie, former St. Paul police detective and unexpected millionaire, does the occasional, unofficial private detective work--mostly favors for friends. He's faced kidnappers, domestic terrorists, art thieves, among others, and had a hand in solving some of the most perplexing mysteries of the Twin Cities. But this time, his prodigious luck and intuition may have finally failed him: He was shot in the back by an unknown assailant and lies in a coma.

His childhood friend, Lt. Bobby Dunston of the St. Paul Police Department, assigns his best detective to the case while other figures--on both sides of the law--pursue the truth. What was McKenzie investigating, what did he learn that so threatened someone that they tried to kill him? What do a sketchy bar in the wrong part of town, the area's prominent tech millionaire family, drug dealers, investment bankers, and a mysterious woman who left an unknown package for McKenzie all have in common? As time slowly begins to run out, the answer to those questions might be what stands between life and death.