When Will Shaw arrives in Spain for a week long sailing vacation with his family, the stressed young businessman is not in a holiday mood. His start-up company is in trouble, and his tense relationship with his disciplinarian father Martin only makes matters worse. But when the family is kidnapped by what turns out to be intelligence agents hell-bent on recovering a mysterious briefcase, Will suddenly finds himself on the run. His whole world turns upside down when Martin reappears, revealing he is an undercover agent tangled in an intergovernmental web of lies and secrets. During a clandestine rendezvous, Martin is killed by a sniper, and Will must find a way to get the rest of his family back alive. With the kidnappers counting down the hours, the Spanish police breathing down his neck for a murder he didn't commit and a cadre of U.S. assassins on his trail, Will flees through Madrid, racing to piece together a conspiracy as labyrinthine as the city's ancient streets. Who can he trust? Who killed his father? And where is the mysterious briefcase that seems to be the key to getting his family home safely? In his quest for answers, Will finds Lucia - a half-sister he never knew he had, who is determined to help him. Bound by their shared loss, the siblings are a force to be reckoned with, but can they overcome the massive odds against them before it's too late?