The Enchanted Bridge (Dragons in a Bag) by Zetta Elliott

Getting three baby dragons back home was just the beginning. Now Jaxon is on a mission to help all magical creatures from Dragons in a Bag! But things in the magical realm are more complicated than they seem in the fourth book in the critically acclaimed series.

With their new special abilities, Jaxon and his friends are not the ordinary kids they used to be. No longer destined to become a witch, Jax finds himself caught up in a secret plan involving the Guardian of Palmara’s mysterious twin brother, Ol-Korrok. As the ambassador to the realm of magic, Jax must convince Sis that magical creatures should be free to return to the human world.

But to reach Palmara, Jax and his friends must cross Ol-Korrok’s enchanted bridge connecting the two realms. Is Ol-Korrok really the ally he pretends to be? Or has Jax set in motion a plan that will endanger both realms?

It takes strength to build a bridge. But sometimes even the strongest bridges must be burned.