(May Contain Spoilers)

Another adventure with Modo and Octavia. This time they set out to see to investigate a possible sea monster causing havoc in the northern Atlantic. The ship they are on gets rammed and Modo is tossed into the frigid waters. He gets rescued by the crew of the Ictineo, a submarine patrolling in the area and learns the real reason they are marking their territory in this part of the ocean.

As in the first book Modo's still very conscious about his real face and not willing to show others even Octavia who he really cares for. So when he's onboard the Ictineo and learns about their plans and what they are trying to create, he understands and is tempted to join them. I noticed that Octavia's always wants to be the more dominant one when it comes to Modo. Maybe because she's older and feels that she's more experienced in espionage but she's always trying to take the lead in the investigation and not letting Modo have his say. But when Modo disappears into the waters, she's desperate to find him and it shows that she cares more for Modo than even she realizes.

Most of the story takes place with Modo onboard the Ictineo submarine so I found it very useful that a picture of the submarine was included on the inside cover of the book. Not only do you get an exterior look of the ship, but you can see what the layout of the ship is like on the inside as the characters frequently moved from room to room while onboard the submarine.

I read the first book a while back and this second book just exceeded my expectations. The story pulls you in and you become invested in the characters new and old...and I was even sad to see some of the new characters go. I highly recommend this series and it would be a great read for boys, girls and adults as well.