sentences:  Alexis explains the meanings and symbols of the dangerous world of Medellín guns, while the author recounts his childhood memories in a Medellín that is no longer the one he once knew.When Alexis is finally killed by two teenagers on a motorbike, Fernando seeks out his killer.He finds Wilmar, another sicario with a surprising resemblance to the late Alexis, not only physically but also in his behaviour.