The untold fourth year of the Enterprise’s legendary five-year mission continues! With the Enterprise crippled and out of phase in a cloaking experiment gone haywire, a Romulan strike force storms the starship, looking for revenge over their stolen technology. Kirk and Spock, meanwhile, must find a way to repel the invaders, while at the same time reverse the experiment and restore the ship—before it fades away completely!
Star Trek: Year Four - The Enterprise Experiment #2
Authors: D.C. Fontana, Derek Chester, Gordon Purcell