SAM - Volume 3 - A Million Winters

Winter blankets the wreckage of the world. In the snow-covered ruins, four
children scavenge for supplies to feed their dwindling group of survivors.
Four, because Ian is gone – captured or killed by the mechanical death squads
that hunt them all. SAM, his robotic guardian angel, has left as well. And
without Ian, without his optimism, the survivors are losing hope. Until, one
day, they recover the electronic device that their friend had built to
communicate with SAM…