When a vital CIA hard drive goes missing, Steven and Samantha must travel to Dublin, Ireland in search of a prisoner who holds the key to its location. Following leads, their mission takes them to England. Meanwhile, Samantha begins to question whether or not she and Steven should speak about their pasts, and Lizzy invests time and money in the catering business.

Just when Steven and Samantha have settled into their romantic Greek vacation, Shaw pulls them away to lend their assistance to an escalating situation in Tel Aviv, where terrorists have seized a hotel and taken hostages. Going undercover with help from Hoyt, the duo soon realizes their mission involves much more than they were told.