One of the hundred books a year I read:

Third book in the Atlee Pine Series—Pine is an FBI agent searching for her long-lost twin sister who was kidnapped at the age of six. The pursuit takes her to a crime family in New York City, but as she works her way from one source to the next, someone keeps killing the people she speaks to. When she turns to other authorities for assistance, doors keep closing hinting that someone powerful is working against her. The buried secret is explosive, but will she find what happened to her sister?