"IMSERH." - Does it mean anything?- No. The Wraiths. They're here

Set against the backdrop of a postapocalyptic Earth whose Eastern Hemisphere was destroyed by a massive solar flare, leaving what life remains mutated from radiation and fallout. The story revolves around a group of treasure hunters who extract such objects as the Mona Lisa, the Rosetta Stone and the Crown Jewels while facing rival hunters, mutants and pirates.