CD Grimes book fifteen: Dead File collector's edition

CD is looking through old files. He comes across an enigmatic note that a man didn't die. It leads to a scheme to get insurance through fraud - but several people did die. It wasn't any accident, it was murder. He goes to St. Warton's and finds the not-dead man. Who was the voodoo queen? How was that car "accident" done - and a lot more