Finding a mass grave in a local lake has caused a mass haunting over one man which Melinda must face.

Jim and Melinda's wedding is overtaken by an ambitious wedding planner while Melinda deals with dreams that seem to threaten her child. Elsewhere, Eli's ex, Zoe, is caught up in a book sale with tragic consequences.

Melinda gives birth to a baby boy who has inherited her gift of seeing spirits. However, the baby has one important difference in gift which will have extreme consequences.

Jim, surprised by his colleague's nonchalance to a paranormal encounter, suspects that he is involved in a med student's sudden disappearance. Meanwhile, Melinda senses trouble when Aiden continues to mention his fear of "the shadows".

When the ghost of a little girl who passed away from leukemia befriends Aiden and threatens Melinda to stay out of her way, Melinda worries for her son's safety.

Henry was 18 years old when he was killed, with a gunshot wound in his chest. In life he was a decent boy from a wealthy, loving family, whose parents believed that he should earn his own living and not rely on their handouts. He masterminded his own kidnapping with a friend of his, and seems relieved to be able to explain to his mother, via Melinda, that he's felt guilt and remorse ever since.

When the ghost Melinda is trying to help suddenly turns up alive, she finds herself in the middle of a dangerous revenge plot and battling enemies she was unaware she had.