Fear the Darkness by Becky Masterman

Retired FBI agent Brigid Quinn, making good on a promise to her just-deceased sister-in-law, Marylin, lets Marylin's daughter, Gemma-Kate, live with her and her husband, Carlo, as Gemma-Kate prepares to attend the University of Arizona.  When one of Brigid's dogs is poisoned and she starts feeling sick herself, Brigid wonders if something is really wrong with her health or if someone is trying to make her seriously ill. Could her current state also have something to do with her investigation into the death of teenager Joseph Neilsen?  In this second novel in the Brigid Quinn series, Masterman writes a page turner that should appeal to readers who enjoy Sue Grafton.  It will be published in January.