Goodwin, Nathan Dylan. Forensic genealogist #9

"Forensic genealogist, Morton Farrier, agrees to take on a case to identify the biological mother of three foundlings, abandoned in shop doorways as new-born babies in the 1970s. He has just one thing with which to begin his investigation: the three women's DNA, one of whom is his half-aunt. With just six days of research time available to him, his investigation uncovers some shocking revelations and troubling links to his own grandfather; and Morton finds that, for the first time in his career, he is advising his clients not to read his concluding report"--Amazon