It is often the case where the second book is a dissapointment compared to the first, but not this one. The dark prophecy was even better than the hidden oracle. It was amazing getting to see leo and calypso together and to combine Leo's sense of humour with apollo's. We got to see both old and new characters in this book which makes it all the more special and unique.I absolutely loved this book and would 100% recommend it to everyone!