Star Trek: Miasma by Greg Cox

Author Greg Cox brings us into the time in between Star Trek V and VI where Sulu has gone off and taken command of the Excelsior leaving the helm officer position open aboard the Enterprise-A. That position for this story at least is being filled by a fan favorite Lieutenant Saavik who shares as bond with Captain Spock. Miasma starts off with the Enterprise-A on a diplomatic faring mission and picks up a signal of unknown origin prompting Captain Kirk to find out where it was coming from but I won't spoil it but I will say that this is a good story that fits in between Star Trek V and VI.