51: Secrets is book four in the 51 series. 51: Secrets Everyone has secrets. Sheriff Lindsay Gold and Agent Wren Gold are no exception and have kept many secrets from each other. Lindsay has kept them to protect the people she loves and who are like family to her. Wren has kept them the protect his wife and because his job requires it. Now they are both finding out some of those secrets which could break the trust they have. Lindsay’s son Dillon and his friend make an unexpected discovery while they are hiking on the property newly purchased by his friend’s family. What they find shows many others have been keeping secrets including Lindsay’s late husband, James. Some of the secrets could have deadly consequences. Discovering them may also lead to answers for many of the questions everyone has and to the true identity of those responsible for the disaster on the base.