- Aha, I remember watching (part of it xp) this series because it used to air right before FMA (the first anime series).
Yes, it has 24 episodes, and the series does conclude, although there are some differences among the novel version, manga, and the anime series. If I remember correctly, after the original author of the novel, Sunao Yoshida died (in July 2004, I think) his friend and also a novelist, Kentaro Yasui continued and concluded the story.
The English dubbed anime series (all 24 episodes) was first aired on Adult Swim (U.S.) in 2005. By the way, we do have a thread for the discussion of this anime series, so I think our awesome moderators can merge this thread to Trinity Blood (anime) thread (it's in Let's discuss your fav anime series here! sub-forum ^^) later.