Hi hannibalchew. I agree with those above that mention the fact that saving a boy who’s not her son is not much of a convincing motivation. In my opinion, her goal should be to save her son after she witnesses what happens to her employers’ son. As a matter of fact, the inciting incident may well be this particular situation, a fact that sets her plan on. Moreover, maybe this virus only afects small children, so you add up some suspense to the fact that she isn’t quite sure that her boy is completely safe until she saves him. In other words, it’s a nanny dealing with infected zombified children. I like the fact that this sounds like a non-stop zombie action flick, kind of a straightforward classic video game. Cheers.