It was a fun start, but I found myself mentally tuning out in the middle when the discussion of time travel delves DEEPLY into various possible paradoxes and explanations of the current scenario. Once that passed, and the characters continued their jolly adventure, it became fun again.

Time travel is hard to explain in books. Especially fiction which doesn't benefit from illustrations. But I intend to take up the third book despite my misgivings in the middle of this one.