Hard Truth by Mariah Stewart

Lorna Temple comes home to close her family's home after the death of her mother. Her brother and sister are not free to help her and she is faced with the job alone. There is construction at the edge of the field, a section sold off to pay for her late mother's medical expenses. When human bones are discovered at the site, memories of two children who disappeared 21 years ago again are in the spotlight. It is determined that the bones belong to Jason Eagan, brother of Lorna's friend Melinda, and their mother has been arrested for his death. Reagan Landry is called upon by Lorna for help, who turns her to T. J. Dawson, ex-FBI agent, now private-eye to assist. When more bones are found, investigators take a second look at the disappearance of the brother and sister. A great story, weaving mystery and murder into a captivating tale.