NCIS Finale Recap: Why Did Tony Leave?

The mortar explosion that destroyed Ziva's farmhouse (and killed Ziva in the process, R.I.P.) wasn't the only bomb that NCIS dropped in its Season 13 finale.

[...] Mossad Director Orli Elbaz (Marina Sirtis) brings Tali to the States to break the news to Tony, hours after he learns that Ziva was killed in the attack.

While Tony's babysitting Tali at his apartment (and getting some child-rearing tips from Jimmy and DiNozzo Sr.), the rest of the NCIS crew are in full manhunt mode for Trent Kort, the former CIA agent who's the mastermind behind it all.