This is not a subtle book. All of the heroes (and they are pretty interchangeable) are smart, snarky, and capable; the villain is unapologetically amoral and can be seen coming a mile away. Narrator Jamie, laid off from a food delivery gig during the Covid-19 pandemic, is offered the chance to work with an “animal rights organization” and snaps it up. Turns out the animals being protected are kaiju, in a parallel dimension accessible with the onset of nuclear power. Scalzi knows what he’s doing; the writing is smooth, the story moves well, and the dialogue is snappy. The monstrous kaiju and the other inhabitants of their crazy jungle biome are also lushly and enjoyably described. Nothing deep here, but solid entertainment.