Barely surviving a Tholian attack that nearly kills him, Kyle Riker — Commander William Riker's estranged father — finds himself the target of a conspiracy reaching into the highest levels of Starfleet Command. Forced off Earth and beyond Federation space, he discovers that even a forgotten backwater world offers no real safety. Set in the gap between Star Trek VI and The Next Generation, part of the Lost Era series.
Summary by Loreful, from public sources