Titan continue their line of novels based upon the original Star Trek series with #3 Dreams Of The Raven by Carmen Carter.
The Enterprise receives a distress call from a merchant vessel and rushes to help, believing that Klingons may be responsible for attacking, hijacking and destroying another trading fleet.
When they arrive they find only one ship left, badly damaged and about to fall apart. However, there is a disastrous event and the Enterprise is critically damaged. As the crew attempt to repair the vessel, now adrift in space and weeks away from any facility, another accident happens when a malfunction in the ship's gravity plating occurs.
There is only one victim - Dr. McCoy. The incident causes a head trauma and when he wakes from his coma they find he has lost all memory back to when he fell from a horse and suffered a similar head trauma - 25 years ago.
As the crew sift through the debris of the fleet, they find bodily remains of a new lifeform, a race of humanoid avians with powerful claws and hard chitinous beaks. The possibility that the Klingons have formed an alliance with a new race threaten to destabilise the quadrant.
It's nice for a book to focus on McCoy for a change and the nature of his injury gives us some insight into the man he was before Starfleet. His exchanges with Spock are particularly illuminating, especially as the two are now on very different footing, with Spock firmly in the right nearly all of the time. However, the real surprise comes in the last third of the book when McCoy reveals something about the current situation which nobody knew.
A good read and a very classic Trek adventure.