The Summer Queen

Moon Dawntreader, Lady of Tiamat, is sworn to protect her world from offworld exploitation and save the immortal mers. However, hostile tribes and treacherous factions conspire against her. Meanwhile, Inspector BZ Gundhalinu, driven by his love for Moon, uncovers ancient starflight technology, inadvertently bringing greed and ruin back to Tiamat. A dark genius named Reede Kullervo, a monster programmed for destruction, is also unleashed upon the planet. These three disparate individuals become entangled in a cosmic mystery that threatens the entire universe, forcing them to confront an unbearable final secret.