Residual Moon — Kate Sweeney

Her only common thread is Dr. Neala Rourke, the curator of the famous National Museum in Dublin, Ireland. She is in Chicago with her archaeological exhibit at the Field Museum, which suspiciously coincides with the two murders.

With a strange and eerie turn of events, things start unraveling. Grayson now is compelled to return to her birthplace and follows Dr. Rourke back to Ireland where ancient Celtic beliefs and mythology are thrown into the mix, turning the detective's logical world upside-down.

However, one fact remains for the determined Detective MacCarthaigh: Someone killed those two women and whether real or mythological - he or she will kill again.