Alien Grimstink has travelled ninety thousand light years to annihilate all life on Earth. 13-year-old Layla Tenby has travelled half a mile to deliver leaflets for affordable fence panels. But, when they swap places, Grimstink finds himself battling traffic wardens and the Subway sandwich ordering system, while Layla is zapped to a strange planet and left fighting for the future of the galaxy whether she wants to or not (spoiler: she does not want to). Is Reece, Layla s annoying younger brother, key to the galaxy s survival, or will his friendship with new bestie Grimstink lead them all to impending doom?From black holes to shopping precincts; from mining satellites to old people s homes; from quantum spaceships to the middle aisle of Aldi. Is this the end of all life on Planet Earth or the beginning of a beautiful friendship?