In a large pot of boiling salted water, cook the gemelli until al dente.
Meanwhile, in a large, deep skillet, melt the butter. Add the garlic, shallot and peppercorns and cook over moderately high heat until golden, about 2 minutes. Add the brandy and use a long match to ignite it. When the flames die down, add the clam juice and simmer for 2 minutes. Add the tomatoes and simmer for 1 minute. Add the shrimp, season with salt and cook over moderate heat, stirring a few times, until the shrimp are just white throughout, about 2 minutes.
Drain the gemelli, add it to the shrimp and peppercorn sauce and toss well. Stir in the parsley and olive oil and season with salt. Spoon the pasta into bowls and serve.