About the book: 2017 / Who knows what kind of application might end up in the most ordinary smartphone? What if it turns the gadget into a pocket time machine? And then ordinary schoolchildren near Moscow will be able to get to Borodin’s field, drive a quadcopter over Raevsky’s fire-spewing battery, see the attack of Napoleon’s “iron men,” and get acquainted with Russian rangers and militias. And this will be only the first journey - next time the outlandish gadget will take them... where? “The day that cannot be changed” will not end soon, and many adventures await our heroes.