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When Ziva begs Gibbs to let her half-niece join the team, Gibbs puts the niece on probation for their newest case- a dead girl from a Marine family who was killed in a very bloody way. But although Bellatrix is amazing in every way, nothing can change her parentage and everyone except Ziva is slightly or really wary of her. Can Bella prove that she isn't just her father's daughter?