OBLIVION'S GATE: Star Trek Coda

Novel. Admiral William T. Riker's grasp of reality becomes more tenuous by the minute. Can his beloved Deanna Troi free him from madness before it's too late? Starfleet's heroes risk everything to set time right. But will Captain Jean-Luc Picard let Beverly Crusher and their son die? Or will he destroy the multiverse to save them?