As with the other books in this series, the premise was quite good. However the medical/scientific/historical jargon tended to, at times, become overwhelming. While the main characters were well fleshed out, the heroine's refusal to leave two small children behind at the cost of quite possibly saving the rest of the world's population was staggeringly stupid. As Spock said 'the needs of the many outweigh the needs of the few or the one'. A scientist of her renown should know this.