When "Ghost Whisperer" returns tonight for its fifth season, it will be five years in the future and Melinda (Jennifer Love Hewitt) and Jim (David Conrad) are the parents of a five-year-old son Aiden (Connor Gibbs).

"We felt that we could tell more interesting stories with Jim and Melinda's child being five years old," Hewitt tells ET's Mark Steines, who is on the set of the hit CBS series.

That said, fans of the show will remember that earlier, Melinda didn't want to have a child because she was worried that it would inherit her gift, which brought her a lot of pain when she was a child.

But when Jim died and his spirit jumped into another body and, then, it took him a while to remember who he was, Melinda decided she needed a piece of him.

"She is overwhelmed," Hewitt continues. "Her son is special because he is hers, but is he 'special' in the 'Ghost Whisperer' way?"

Hewitt directs the premiere episode and she jokes, "I am so bossy by nature, it is perfect."

But that isn't the only way in which she is spreading her wings. She is also the author of a book that will be released in spring of 2010, which she has been working on for four years.

"It is my thoughts on dating," she tells Steines. "Most books are anti-guy. My book is about how guys probably aren't as wrong as we think … and we should look at ourselves."

"Ghost Whisperer" returns will all-new episodes tonight at 8 p.m. on CBS.