Mathilda, a twelve-year old New York girl, is living an undesirable life among her half-family. Her father stores drugs for two-faced cop Norman Stansfield. Only her little brother keeps Mathilda from breaking apart. One day, Stansfield and his team take cruel revenge on her father for stretching the drugs a little, thus killing the whole family. Only Mathilda, who was out shopping, survives by finding shelter in Léon's apartment in the moment of highest need. Soon, she finds out about the strange neighbour's unusual profession - killing - and desperately seeks his help in taking revenge for her little brother. Léon, who is completely unexperienced in fatherly tasks, and in friendships, does his best to keep Mathilda out of trouble - unsuccessfully. Now, the conflict between a killer, who slowly discovers his abilities to live, to feel, to love and a corrupt police officer, who does anything in his might to get rid of an eye witness, arises to unmeasurable proportions - all for the sake of a little twelve-year old girl, who has nearly nothing to lose.
A hit-man tries to lose himself in New York. When a neighbor family is killed, he takes in the surviving twelve year old girl, and teaches her to be a cleaner, so she can avenge her little brother.
Leon is a hitman, and happy with his life. When a young women comes home to find her family has been killed by a drug dealer, she runs to him for help. When she discovers he is a hitman, she asks him to teach her the skills to take her revenge.
Leon is a first-class hit man, but is also a sensitive guy who loves his potted plants. He is moral: "No women, no children" is his professional motto. He is sympathetic to his neighbor, Mathilda, a typically rebellious twelve-year-old who has trouble with her family. But when her father runs afoul of drug kingpin Norman Stansfield, Mathilda turns to Leon for assistance.
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