Inmates in the Tower of London may not have had to worry about advanced security technology when plotting their escapes, but then, not many prisoners today have to deal with crossing moats. The 1597 jailbreak of John Gerard, a Jesuit priest imprisoned and tortured under Queen Elizabeth I's Protestant reign, involved orange-juice invisible ink, string, rope, a boat, a little help from his friends and, as Gerard would have it, a lot of help from God.