I want to know who Tommy is. Thus encouraged Tuppence plunged into her tale, and the lawyer listened with close attention.
Only Tuppence knew about Tommy and thus the lawyer had to ask Tuppence.
mnli hypothesis: Only Tuppence knew about Tommy and thus the lawyer had to ask Tuppence. premise: I want to know who Tommy is. Thus encouraged Tuppence plunged into her tale, and the lawyer listened with close attention.