The secret to this restaurant-quality bisque is to make the stock yourself and take the time to go through the gyrations of cooking the shrimp shells in mirepoix (veggies), pureeing the cooked mixture, and then straining out the bits of shell. The result will be one of the greatest shrimp bisques you've ever enjoyed!
Great served in shot glasses during a party! 
Peel the shrimp, keeping all of the shells. De-vein and butterfly ten of the shrimp and set aside for the soup. Use the other ten shrimp for some other dish.