In the premiere, FBI agent Peter Donnelly unearths an international mystery while investigating the murder of a young American in Jerusalem.

Peter searches for the murderer while also pursuing Yussef Khalid; and forms an uneasy alliance with Det. Golan Cohen while dealing with an unexpected revelation. In other events, Avram begins his journey to Israel with the red heifer; and Billingham and his disciplines prepare Josh for a life-changing event.

Peter's pursuit of Khalid dead ends; and he and Cohen follow clues found in Emma's journal. In other events, Debbie takes Josh for an unauthorized outing; and Avram continues his journey to Jerusalem.

Peter's discovery of an ancient coded secret leads to a race to find the final stone; Debbie faces the consequences for her attempted kidnapping of Josh; and Avram is shadowed by a deadly assassin.

Peter delves into Emma's past, which leads to the discovery of a long-hidden, ancient symbol; someone from Debbie's past attempts to rescue her; and Lynn's life is put in jeopardy.

Cohen arrests Emma's suspected killer; Peter makes a startling discovery; Avram and the red heifer are kidnapped in Croatia; and Billingham tries to prevent Debbie and Josh from exposing his secrets.

Peter turns to Golan for help after a breakthrough in the Emma Wilson case; Ridell pressures Lynn to get Peter out of the country; and Debbie has to make a dangerous trade with Tad Billingham if she hopes to avoid bloodshed. In other events, Rabbi Lev and a new partner head to the underground tunnels to carry out their mission.

Lynn suspects that there may be a mole at the consulate; Margrove and Peter both head to a convent, but they have different goals; and Debbie returns to the compound seeking vengeance.

An ancient religious sect is ready to enact its plan; Peter partners with unlikely allies; Lynn realizes the depth of the conspiracy while investigating Ridell; Golan tries to crack more clues from the Donaldson case; and Avram moves to protect his valuable asset.

Peter races to stop the Order of Moriah's plans of destroying the Temple Mount.