This summary of S7, epi 1 appeared on the main CBS NCIS forum, translated from a French website; looks good:
Gibbs and the team work on a drug case in the Navy. Two bodies are in the morgue and a Petty Officer is in critical condition. They may not have known they took drugs. While the NCIS is investigating, Specials Agents DiNozzo and McGee "hear" the future successor to the former liaison officer with the Mossad, Ziva David. The DEA agent Emily Garver and the police officer Heather Pearson will meet Tim and Tony, but will they appeal to the one who makes the final decision, Gibbs? But Ziva has not been forgotten, since her return to the Mossad, she is tracked by the NCIS. Three weeks after her Aliyah, Ziva seems to have disappeared... but Special Agent Chad Dunham in infiltration in Muslim countries, may have perhaps located her.
