Amanda knows where her baby is (being cared for by a caretaker), and has put the kibosh on Jake's original plan to wait a few months and then claim they "adopted" the baby. She needs to be with her son NOW. So Jake and Amanda bring her son back to Pine Valley and hatch a plan to get him back into Amanda's arms full time -- all while keeping David none the wiser. Because they live in the town they do, they're not back five minutes before Liza enters the scene and hears a baby crying. Liza, of course, thinks that her baby is really Amanda and David's child (it's not, obviously), so a discovery of the truth might just be the first in a domino effect that results in David finding out.
All this, PLUS: Annie works her crazy bangs magic on Scott; Marissa tries to bring her parents back together; Marian appears; someone's torturing Randi; and Adam may find he's just as integral to the "Who killed Stuart?" mystery as Emma is.