Earthdivers (Earthdivers #2)

After dodging the apocalypse, four Indigenous outcasts are past the point of no return on their audacious one-way, time travel mission to save the world by killing Christopher Columbus. Immersed in 1492 as an undercover crewman, Tad-a brilliant Lakota linguist and wildly unqualified avenger-must rally from the tragic consequences of his early actions on board and recommit to spilling the admiral's blood before landfall. In the year 2112, ringleader Yellow Kid and headstrong Sosh encounter a haunting sign of Tad's progress in the past, and back at the cave portal, Emily watches her back as her suspicion of Yellow Kid skyrockets.