I like Ross Welford books (Hamster, Invisibility, 1000 year old boy) but this book was really, really, particularly impressive. His best yet! There's a plague. The protagonist thinks she is responsible for it's spreading (I'm not arguing with her on that one). Dogs die. People die. It's the end of the world. Time travel. Bravery. Threat. And, heart. It's all there. Thoroughly recommend.