Baked beans might seem harmless but, in the wrong hands and the wrong millennium, they can do a surprising amount of damage. 11-year-old Oliver Starling thinks Romans are ancient history… until he teams up with Agent Owl to stop an evil mastermind from conquering Roman Britain with baked beans and nappy pins. Armed with only a photo-booth time machine and a pocket history guide, can Oliver and Owl keep the villainous Dr Midnight from changing the course of history forever?