A brawl at a bowling alley between rockers and mods leads to decapitation; when the police arrest Violetta's nephew for the murder, Peregrine tries to prove his innocence.

The gang gather at the river to relax and distract themselves from their assorted heartaches, but when Samuel hooks a corpse with his fishing rod, a day in the sun turns deadly. It emerges that the victim evaded murder charges many years ago, and so Peregrine and James search for a suspect with motive for revenge.