I wasn't expecting all that much, since it's 'young adult' fiction, but the characterization and plot are quite sophisticated and complex. The exploration of racism in turbulent early-twentieth-century Chicago is fascinating, and I love that the plot is based on real events -- the tragic death of a boy who swam just a little bit over the invisible line separating white from black beach. I attended a talk where Steve Bellinger talked about doing historical research, and have a great deal of respect for his fidelity--it's so tempting to change history just a little bit, to make our stories "work better"! Tony is a believable protaganist, and the other characters just as compelling. I've read other novels about time travel, of course, but Steve Bellinger's thesis about its consequences is unique and disturbingly credible, making me wonder how many time travelers our world has already seen, and what events in world history may be ... well, you'll see! The ending is perfect. Just Perfect.