3.5 stars for a book full of fan favorites. 
 I love reading books and superheroes, but books starring superheroes are not that common. Maybe because comic books and movies are better mediums for the genre? 
 And yet, it doesn't mean it does not work. 
 If you read the synopsis, you know this is a YA book and Natasha is not the MC but we do get to see her quite a lot and not only as a "reluctant mentor figure". This is as much "kinda sorta" Black Widow backstory as a Red Widow character introduction and it works well. 
 Unfortunately, the bitter soul I am, only can think that Marvel could indeed deliver a BW story, where she stands on her own and yet we don't get a movie. 
 You know, I'm all for books, but this still annoys me much. 
 Because right now, it's sadly true that books don't have as much exposure as movies and I wished Natasha's story was as big as her fellows avengers. 
 And also, am I supposed to consider this as part of the current MCU story? 
 But after that little rant, as I said Natasha was not the MC (she's not but still they use the Black Widow name as a selling point for us little marvel girls craving peeps we are) , I will read her little sestra's adventures on the page.