The tenth was not widely known about, however Henri knew and gave this information to Number Four in his letter. Ella was initally thought to be Number Ten as she had escaped separately in a Second Loric Ship and her Cêpan Crayton, who knew the truth, made out that this was the case - suggesting that the real Number Ten did not leave Lorien. Setrákus Ra seems particularly interested in the possibility of a tenth when questioning Sam Goode about it.