When Sepron the Sea Serpent promises to bring floods, starvation, and fear to the people of Avantia's coast, Tom and Elenna must figure out a way to stop the terrifying beast.
When a legendary sea monster starts making waves in the Sea of Wrenly, Prince Lucas and his friend Clara travel to the Island of Primlox seeking information that might help them calm the beast.
Ulf, a werewolf, risks his own life to save a sea monster at the Royal Society for the Prevention of Cruelty to Beasts, but his trouble worsens when the evil Baron Marackai shows up with a plan to put beasts on his dinner menu.