The Trial of Extinction (Bridgers 5)

Infinity and Desmond are bridgers, sworn to protect travelers to
alternate versions of Earth. But now their own Earth has been destroyed,
and they have a new task—protecting a small community of fellow
refugees who managed to escape to a world teeming with giant arthropods.
Stranded there, they’ve gradually managed to etch out a fulfilling
existence. But it seems nothing good can ever last.

Infinity
and Desmond’s hopes of living out their lives in peace are shattered
when their old friend Armando inexplicably bridges to their world.
Armando’s arrival triggers a devastating series of events and forces the
bridgers and their fellow refugees to leave their new home. After
narrowly escaping, they find themselves entangled in a cruel game, a
trial to decide humankind’s worth. The rules of the game are unclear,
but the stakes are high—the annihilation of billions of people.

Caught
up in an impossible dilemma, on a world populated by extraordinary
sentient creatures, Infinity and Desmond discover the limits of what
they are willing to do for their species—and for each other.