Kirsten Weiss. The Metaphysical Detective (2012) 242 pp. [e-book]
Publishers description: When Riga Hayworth finds her new client, Helen Baro, dead, she smells a set up of metaphysical proportions. Now, to find a killer, Riga must travel from San Francisco to the underworld—and make it back alive. Helen believes her husband is trying to kill her. One problem: Helens husband is dead. Riga isnt sure what to think. Is Helen mad? Is someone else trying to harm the woman? Or is this really a case of attempted murder from beyond the grave? But then Helen is found dead, leaving a strange haiku and Tarot for a clue, and Riga is hurtled into an investigation that threatens the detective and those she loves.
Setting: San Francisco