This is the 10th booking this outstanding and fast-moving series. It can be read as a standalone but reading the series in order will enable you to understand the backstory. It is the dead of winter in Sorenson, Wisconsin and snow storms are impeding movement. Mattie Winston and her homicide detective husband Steve Hurley are dealing with a human trafficking ring. Mattie and Hurley along with their two children have moved into their new house. Mattie is called to the ER as a young girl was brought into the hospital and dies there. She informed the staff that the group had her sister. Before she passed she mumbled, "lost group". Mattie and friends must work fast to save the sister. Are they in time? I HIGHLY RECOMMEND THIS BOOK AND SERIES. Disclosure: to Kensington Books for a copy through NetGalley. The opinions expressed are my own.