Definitely continue with the story. If you feel, once you have finished it, that you're not satisfied with how your plot and characters have developed, re-write it, but try experimenting with this first draft first, because that's the fun part! I really like the plot, and how you describe everything the characters see and don't see. I really, really hope you continue with it, because, to be honest, Gerard and Frank have met properly, they're on the run, and you're going to leave us hanging? Unacceptable :L
B xo