Something Wicked

In David Housewright's next hardboiled mysterySomething Wicked, Rushmore McKenzie, who promised to retire after his last nearly-fatal case, gets talked into doing an old friend a favor involving a castle, a family fighting over an inheritance, and at least one mysterious death.
Rushmore McKenzie was a detective with the St. Paul, Minnesota PD until unlikely events made him first a millionaire and then a retiree. Since then, he's been an occasional unofficial private investigator - looking into things for friends and friends of friends - until his most recent case put him into a coma and nearly into a coffin. Now, at the insistence of his better half Nina Truhler, he is again retired.
That is, until a friend of Nina finds herself in dire straights and in desperate need of a favor. Jenness Crawford's grandmother owned the family castle - a nineteenth century castle that has been operating as a hotel and resort for over a hundred years. Since her grandmother's...