Fresh Corn Soup With Crab

Name: Fresh Corn Soup With Crab
Ingredients: 2 tablespoons unsalted butter; 1 medium onion, chopped; 1 medium carrot, chopped; 1 celery rib, chopped; 1 garlic clove, chopped; 6 ears of corn, kernels cut off; 1 bay leaf; Large pinch of saffron threads; 4 1/2 cups water; Salt and freshly ground pepper; 1/2 pound lump crabmeat, picked over; 1/4 cup shredded basil