An explosive, race-against-time thriller and the first book in the internationally bestselling Ryan Lock series. For fans of Lee Child, Harlan Coben, Robert Crais, and James Patterson's Alex Cross series.
It's Christmas Eve in New York and for ex-military bodyguard Ryan Lock it's business as usual. His task: to protect the head of one of America's most powerful corporations.
But when a bloody massacre leaves bodies littering the streets of midtown Manhattan, Lock’s hunt for the killers turns into an explosive game of cat and mouse.

Daily Telegraph Thriller of the Year.
"An impressive debut novel featuring one of the finest female villains since Ian Fleming's Rosa Klebb...this is a writer, and a hero, to watch" - The Daily Mail
"Sean Black writes with the pace of Lee Child, and the heart of Harlan Coben. Lockdown is a sure-fire winner" - Joseph Finder, New York Times Bestselling Author of Buried Secrets
"Funny, tough, and furiously paced, Lockdown explodes off the page" - Jesse Kellerman
"Supremely slick...An excellent first novel" - The Daily Telegraph
"Hold on tight - this one burns like a lit fuse" - Gregg Hurwitz, Internationally Bestselling Author of You're Next