Not the strongest of the Valerian books. The last one in particular is exciting but requires you to have read practically every novel up to that point, as it sort of ties together a lot of uncertain plot points. The other two are a double-bill, but not as good as the previous ones. However, the stories are definitely much more mature than they were near the beginning of the series, and I enjoyed the humour and art a lot, so thumbs up from me ( )