Dominika Egorova er mange ting. En hengiven datter, der er fast besluttet på at beskytte sin mor uanset konsekvenserne. En prima ballerina, der stålsat har presset sin krop og sind til det yderste. En mester i forførelse og manipulation. Da hun bliver alvorligt skadet og må stoppe sin karriere går Dominika og hendes mor en dyster og usikker fremtid i møde. Tvunget af omstændighederne bliver hun manipuleret til at blive en del af den hemmelige efterretningstjeneste, ”Sparrow”, der træner exceptionelle unge mennesker til at bruge deres kroppe og sind som våben. Efter at have gennemgået en pervers og sadistisk træning udvikles hun til den farligste Sparrow-agent nogensinde. Med livet som indsats, må Dominika forene sit gamle jeg med den nye magt hun nu besidder, for at redde dem hun holder af – alt imens en amerikansk CIA-agent prøver at overbevise hende om, at han er den eneste person hun kan stole på.
Dominika Egorova is many things. A devoted daughter determined to protect her mother at all costs. A prima ballerina whose ferocity has pushed her body and mind to the absolute limit. A master of seductive and manipulative combat. When she suffers a career-ending injury, Dominika and her mother are facing a bleak and uncertain future. That is why she finds herself manipulated into becoming the newest recruit for Sparrow School, a secret intelligence service that trains exceptional young people like her to use their bodies and minds as weapons. After enduring the perverse and sadistic training process, she emerges as the most dangerous Sparrow the program has ever produced. Dominika must now reconcile the person she was with the power she now commands, with her own life and everyone she cares about at risk, including an American CIA agent who tries to convince her he is the only person she can trust.