The Mark of Athena is the third book in the Heroes of Olympus series and is another page-turner by Riordan. The Mark of Athena sees the Roman and Greek demi-gods travelling around the US, battling sea monsters in the Atlantic before trying to prevent giants from destroying Rome and then the rest of the world. We learrn more about Leo and Hazel with Piper and Annabeth also receiving more narative time than the male characters. The writing is well-paced and the characters, as we are used to with Riordan, are well-drawn. I had mixed views about the ending - slightly disappointed that the story wasn't fully resolved but pleased that it means that there will be at keast one more book. Highly recommended for the children and adults alike. I do recommend, however, that you read the first two Heroes of Olympus to appreciate fully this book.