Aired: March 27, 2012 | Season: 4 | Episode: 19

Overview
Runtime: 44m
Directed by: Paul Holahan
Written by: Shalisha Francis
Guest stars: Ann Reilly, Christine Woods, David C. Scott, Gilbert Owuor, John Ruby, Kate Siegel, Lorin McCraley, Matthew Carey, Michael Alperin, Michael Rose, Nikki Novak, Samuel Child, Tim Guinee, Walter Perez, Wil Bowers
Description
When a bomb explodes at a protest rally killing five people, Castle and Beckett realize the key to solving the case is to reconstruct the 47 seconds prior to the explosion. Using video and witness accounts, they uncover the shocking truth about who planted the bomb.