Impasse: An Arthur & Irma Blake Mystery

The discovery of human bones while excavating a property to build a new church requires all work to stop. Arthur and Irma Blake investigate and find an earlier structure on that lot was involved in illegal activities, requiring FBI leadership of the inquiry. Further research reveals a group of foreign citizens who replaced Americans illegally and an elaborate money laundering scheme. What are the foreigners trying to do? Who killed the people unearthed during construction and others discovered later? How will the killer be brought to justice more than twenty years after the crimes?