For much of the story Daniel's never quite sure where he stands with Thacia. Sometimes, she can display incredible hostility towards him, as when she tells Daniel to his face to leave Joel alone. Joel could be a rabbi one day, she says; the last thing he needs is to fall in with a gang of thieving outlaws.

Later on, however, Thacia gets with the program and pledges herself to the cause of liberating Israel from Roman tyranny. It is she who devises the precise wording of the vow that she makes along with Daniel and Joel. Not only that, but she suggests the bronze bow, from the Song of David, as a symbol of their sacred oath. Thacia believes that this symbol is appropriate as it represents the strength that the love of God can inspire in his children. With God's love, you can do anything, even what appears to be the impossible, such as driving the Romans out of Israel.

First, Thacia has insisted on being a part of the pact the two boys make to win the fight of the Jews to oust their Roman oppressors.

Secondly, it is Thacia who takes Daniel in when he is injured, despite her father's injunction that he never be allowed in their home again.

Thirdly, it is Thacia who comes up with the plan to dress as a boy and wander about town with Daniel. As she and her brother Joel are twins and look a good deal alike, she can "pass" as her brother, thus providing Joel an alibi when he goes on his quest for Rosh to discover which of the town's wealthy will be away from their homes to attend the banquet.