Impulse is the fourth book of the Morphers.
When a Vulture Organism wrecks havoc in the city, Caleb must muster his strength to defeat it, even with Rachel's concern.
The story starts off with the Morphers practicing with their new found powers, but fail to shape shift into any creature after several attempts. Afterwards, Caleb decides to go home, causing Rachel to tag along with him on the way, much to the former's annoyance.
Suddenly, the duo