Pip Bartlett's Guide to Sea Monsters (Pip Bartlett #3‪)‬

From bestselling authors Maggie Stiefvater and Jackson Pearce comes the third installment in a series bursting with magical creatures, whimsical adventures, and quirky illustrations.Pip and Tomas have deal with magical creatures that burst into flames and runaway unicorns. Now they have to go under the sea to deal with a new group of magical SEA creatures that are very cute but also a load of trouble.