Theme and Summary of Mark of athena

In my book, the demigods of the Greek camp ( camp half blood) went to the roman camp (camp jupiter) to talk. Two campers, one from each camp were abducted and put in the opposite camp. Now, the Greeks have came to get their camper and bring the roman camper back. While the two camps chat, some one unexpectantly fires on the camp. The commotion comes from the Greek ship. Suddenly the Romans start attacking. The Greeks have to leave wondering who had fired on their new friends.I think the then so far is keep your enemies close, and your friends closer.