This picks up where the last book left off with Charlie going after her partner Hank, the Siren. He has been taken back to his world for trial and Charlie is determined to bring him back. There is also a fae murder to solve for the impatient Druid King, Pen. She is also learning more about her new abilities on her journey and discovering what it all means. She gets some unexpected help from the Oracle on her journey. A lot of excitement and battles kept this moving at a good pace. Some romance as Charlie deals with the possibility of Hank becoming more than just her partner. I would recommend this series to anyone who likes a strong heroine and other worldly action.