Melinda learns some uncomfortable truths on tonight's "Ghost Whisperer."

The "Ghost Whisperer" wraps up its season tonight when Melinda (JENNIFER LOVE HEWITT) uncovers the truth about her family's past through a series of bodily possessions.

On last week's episode, Melinda, after many years and a long search, reunited with her father (guest star MARTIN DONOVAN), who she discovered was a prosecutor in Grandview and may have convicted an innocent man, who is now seeking revenge.

When Melinda rushed to warn her father, she may have been too late. The door to his hotel room was jammed, and there was blood seeping out.

ET was on the set with the actress, who told us, "You will find out what the deal is with Melinda's dad; and we will go back into what is happening with her and her half-brother. It is going to be a big part of our season finale."

The "Pater Familias" episode of "Ghost Whisperer" airs tonight on CBS at 8 p.m., and ANNE ARCHER reprises her role as Melinda's mom.