Cover of Preserver
Preserver is a novel by William Shatner, co-written with Judith and Garfield Reeves-Stevens, based upon the television series Star Trek. The novel was released in 2000 in hardcover format. This is the conclusion of a trilogy that began with Spectre and Dark Victory.
Kirk's Mirror Universe double, has risen to power as the evil Emperor Tiberius. This alternate universe version has failed in his quest to learn the secrets of the advanced 'First Federation'. Tiberius tries to intervene in Kirk's universe to learn the secrets of its version of the First. To complicate matters, Kirk's wife Teilani is deathly ill, a situation Tiberius gleefully takes advantage of in order to secure Kirk's assistance.