J.T. Ellison Dr. Samantha Owens Series Books 3-4

Forensic pathologist Dr. Samantha Owens thought life was finally returning to normal, when she receives a letter from a dead man imploring her to solve his murder. There's only one catch. Timothy Savage's death was ruled a suicide. When Sam learns Savage left a will requesting she autopsy his body, she feels compelled to do it. Sam discovers clear signs that Savage was murdered and she finds DNA from a kidnapped child whose remains were recovered years earlier. Nothing about the case makes sense, but it is clear someone is unwilling to let anyone, especially Samantha Owens, discover the truth.
What Lies Behind
Waking to sirens in the night is hardly unusual for Samantha Owens. No longer a medical examiner, she doesn't lose sleep over them, but a routine police investigation in her neighborhood has her curious. When her homicide detective friend, Darren Fletcher, invites her to look over the evidence, she immediately realizes the crime scene was staged. What seems to be a clear case of murder/suicide is anything but. The discovery of toxic substances in hidden vials indicates that something much more sinister is at play?
Unsure who to trust, Sam and Fletch find themselves up against very powerful people at every stage in the investigation. No one is who they appear to be. It's Sam's most complex case yet and the terrifying reality is beyond anything she could have imagined.