A heartbroken ghost searches in vain for her baby. Pekin Dewlap and her best friends Scout and Amber are hired to help her spirit go into the light by the kindhearted homeowners who've grown fond of the crying ghost. The teens move into the house while their clients are on a cruise, and their first order of business is to find out the ghost's identity. A neighbor is able to provide the name of the house's last owner, and the story of how his wife died in childbirth. Now, armed with the ghost's name, along with those of her husband and baby daughter, it's time to set the ghost free.

However, it isn't as easy as the kids expect. First, Lily the ghost doesn't seem to be aware of their presence, and when she finally "sees" them, she becomes angry and destructive. The Ghosties track down Lily's husband and daughter to ask for their help, but, much to their surprise, their invitation is met with hostility. The father has secrets of his own that he must protect.

If Pekin and her friends can't convince the father to help them, they may never be able to set Lily free, and send her into the light.