Sentinels in the Deep Ocean (Wild Rescuers, Bk. 4)

Stacy's world is about to get a lot bigger.

Fresh off their expedition on the tundra, Stacy's supernatural wolves finally have answers about their origins as well as several newly developed powers. Meanwhile, Stacy has a new cat to care for and a mysterious diary to decode. The secrets buried in it pages send Stacy and her pack on a thrilling race against time across biomes to the farthest reaches of their world: the deep ocean.

The ocean is brimming with mysteries, but the biggest surprise of all is that Stacy's wolves are not as alone in this world as they thought they were. Could a secret from Stacy's past hold the key to her future in the taiga?