While Sam is giving lectures at the university, a fellow lecturer is found murdered and Sam is called to do the examination. She finds it difficult as she knew the victim, but she still strives to find the answers to unanswered questions.

Sam is called to the scene of the death of a Gemma Boyd, who appears to have fallen down the stairs. Sam believes that she has actually been pushed and sets out to find her killer.

Investigating the drug-related death of a single mother and her child, Sam finds herself tangled in a web of lies, corruption and revenge, as she attempts to uncover the truth behind the deaths.

When a body is found between the blades of a harvesting machine, Sam is called to the scene to examine the body. At first it looks like an accident, but when the body is re-examined later, a wound is discovered that was not made by the harvester. As Sam delves deeper, she discovers that the case could have something to do with someone's past in Northern Ireland.