Heart of the Maelstrom is the second book in the Masters Trilogy.
In Heart of the Maelstrom, we meet the Masters, an enigmatic and ancient race from a distant star cluster. We also meet Christopher Hunter, a new character whose simple life on Earth is going to get significantly more complex when he runs into the Masters.
Returning from the first book are Jack Davidson, Sarah Admunsen, and David Chang, three pilots on the Pegasus who are on the front lines in the fight against the Masters. Joining them are advanced robotic life forms, fuzzy intelligent aliens the size of small dogs, bird-like aliens with hammer-shaped heads, and sentient starships. They must all work together if they want to survive!
Heart of the Maelstrom is a story of military life in a science fiction setting, but it's also the story of very ordinary people who are forced into extraordinary circumstances.