Louie Evans has become a Boston legend by riding around the city on his tricycle and yelling what some people call a "siren noise." Who is he? Why does he ride? Interviews with the employees of Back Bay Bicycles, the store that does complimentary repairs for Louie's bike, and Louie himself outline the mysterious 'trike rider's life as a dedicated bicyclist and as a compassionate, misunderstood person.

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