The Chilling Spree. Eriksson (Darkwater Bay), #4

Following the events in Forgotten Place, Helen has little time to mourn losses and misfortunes - and her role in the carnage -before a massive amount of human blood is found in an equipment storage chest back stage at a New Year's Eve concert. After a brief search, a young woman's body is discovered, only she isn't what she appears to be at first glance. As Helen debates her need for involvement in the investigation, Johnny Orion seems determined to prove that he's still the state's top cop - with or without all of his recent memories intact.
Yet Helen's the one doubting her abilities before long when a case she thinks is cut-and-dried takes a sudden turn into chaos and unexpected victims start piling up. When two victims are undeniably related to Detective Crevan Conall, Helen realizes her error, that the personal tragedies around her resulted in missing an important clue, one that solves the case. A surprising twist in the end serves Helen's warped sense of justice, which cannot run parallel with the law this time.