Aliens in the Gift Shop by D.E. Morris
Genres: Action & Adventure, Alien Contact, Science Fiction

Aliens in the Gift Shop follows two extra-terrestrial scientists who have arrived on Earth for their first reconnaissance mission: to study and gather information about human society and interaction. Due to a miscalculation in their environmental data the mission is a complete disaster. While trying to salvage their assignment, they discover that they have brought with them an object that is vital to the survival of their planet. This discovery unwittingly puts them, and the Earth, into the interstellar cross-hairs of their enemies, who will stop at nothing to acquire it.