Echoes from the Mist by Blayne Cooper

In this sequel to Cobb Island, paranormal researchers Kayla Redding and Olivia Hazelwood begin their professional and personal partnership as they tackle their first case together in the world's most haunted city - Edinburgh, Scotland. While in Edinburgh, the women visit the Cobb family ancestral home. The Cobb family historian takes the women on a journey back through time to 17th Century Colonial Virginia. He weaves the tale of Faylinn Cobb, explaining what happened to her and her family after her sister-in-law, Bridget Redding, was branded a witch.