Arena of the Lost Worlds

He was three weeks from retirement. Then a burning warehouse opened into another world.
FBI agent Mason Marsh expects one final mission before trading raids and gunfire for a fishing boat and quiet mornings on the water. Instead, a child-trafficking investigation leaves him trapped inside a burning warehouse with ten-year-old Graysen Makai.
Their only escape is an ancient doorway that should not exist.
On the other side waits an alien jungle filled with lethal creatures, impossible technology,...