Annelise lives a normal, slightly hectic life like any other college student does. There's only one difference : she's an Assassin by night. (cliche, yes yes, but you gotta read it cause it's bit different.) The thing is, she doesn't kill the people she's assigned to get. She lives as peacefully as anyone with a double life does. That is, until someone in the assassin's network starts giving out many assssin's real names and, for some, it starts showing their pictures. Fingers start pointing at her, and the rest is history.

"Black Beauty" is narrated as an autobiographical memoir told by the titular horse named Black Beauty—beginning with his carefree days as a colt on an English farm with his mother, to his difficult life pulling cabs in London, to his happy retirement in the country. Along the way, he meets with many hardships and recounts many tales of cruelty and kindness.