Aired: February 24, 2017 | Season: 4 | Episode: 15

Overview
Runtime: 43m
Directed by: Michael Caracciolo
Written by: Brian Studler, Marisa Tam
Description
After being dosed with a deadly poison, Red must retrace his steps to uncover who of his closest confidants has betrayed him. Meanwhile, Liz and the Task Force desperately search for the designer of the toxin in a race against time to save Red.