When the ship arrives, the Jarada seem uncharacteristically friendly. They invite Picard to send down members of his crew and negotiations proceed both quickly and smoothly. Suddenly, however, the Jarada change. They cut off Commander Riker and his away team from the U.S.S. Enterprise and initiate an unprovoked attack on the ship. Now Picard must unravel the aliens' mystery before it's too late for the away team - and the U.S.S. Enterprise.
(From the Star Trek Series shelf.)