The Barlow Bridge Machine

If you could travel back in time, what could you do? How could you use it to win the war or stop it before it even started? Are there rules which have to be followed? If so, what are they? What happens if you break them? Blaise Hall is a government facility hidden in plain sight outside Liverpool, England in a little village called Hightown. At the outbreak of World War II, two scientists are brought there to build a time machine, a Barlow Bridge time machine. This is not an average time travel book. There is no handsome hero. There is a pretty mathematician, a Jewish assassin and B.B. Jones, our anti-hero. But it is war; how far would you go if you were pushed to breaking point?