Hmmm… A lass, that the blurb yet not the book itself says is there subverting the American immigrant police on the Mexican border, gets more than she expected when not one but two aliens crashland on her patch. Something something rift warpy happened during some intergalactic battling, and therefore they might be stuck. But if – IF – they can collaborate, they might be able to have more say in their future.
This works as a kind of naive 'found family' formation, with the Earthling lass, Cora, and her dog, and the characters and tech from elsewhere. But it's clearly lumbered with too much it can't juggle at the same time. The whole migrant thing is as blunt as a sledgehammer, and the book is ill-equipped to say anything interesting there. The bigger sin perhaps, depending on your point of view, is that we just cannot understand the something something rift warpy thing – it seems to be a kind of hyperdrive that has been weaponised, or certainly you don't want to be flying a spaceship directly behind.
And you're just settling into the 'found family' storyline, with the lesson (that seems to have reached the aliens through the something something rift warpy thing, whereby they watched 'From Here to Eternity' and other films) that we can all go out and be wonders, and defy those who would deny us our dreams – when the whole thing grinds to a halt, the team split up. You could therefore easily argue that all three aspects of this have been a failure, then – for which two stars is about its lot.