"Seeker" is the third novel with protagonists Alex Benedict and Chase Kolpath (the others being "A talent for war" and "Polaris"). The novels are only loosely related and can be read single. Since there would be one mayor spoiler in reading this book first, I would recommend to read them in order, although I liked the "Seeker" best of all three.
Benedict is a mixture of Fandorin and Indiana-Jones: an upper-market antiques-trader, who searches for new merchandise tracking long-lost starships and space-colonies. Kolpath is his loyal pilot, occasional spy, and skilful operative. In "Seeker" a seemingly harmless deal develops into a search for a colony, lost since 9000 years. The search involves a long trip of Kolpath into the systems of the "Mute", the only other sentient species in the known universe, and it culminates in tragic and fantastic discoveries and a deadly & surprising confrontation.
"Seeker" as "A talent for war" and "Polaris" is a fast paced mixture of thriller and adventure novel in a SF setting. The plot is interesting, well developed, and exciting. The story includes a few side plots, the universe is very coherent, and the characters are very nicely introduced and build. McDevit does not dwell on lenghty descriptions of technology, socio-political constructs, or space-battles - his strength is to tell a good suspenseful story.
I like the series and recommend all three novels: the main themes are classical, the characters are well done, the plots are thrilling and the science-fiction elements (some of them quite novel) are introduced in an unobtrusive way, never hampering the flow of the story. Those, who know the first volumes are in for a little shock in the end.
This is a very nice to read, good SF-thriller/adventure story.