Mr. Quark is a down-on-his luck pot-smuggler hiding out in the mountains of Colombia with his dog, High Pockets, and a small band of banditos led by the irascible Jose. Only months before, these three and their fearless associates were rolling in millions in cash and high-grade marijuana, eluding prosecution on -ridiculously false- drug and terrorism charges. But times have quickly grown lean, and to liven up their exile, Jose decides to mug a family of American tourists.

Among the spoils are physics texts, which launch Mr....