Shawn and Gus are buying candy with Henry when Shawn ends up winning a contest and getting a bunch of free stuff.
Shawn takes on a job at the space center which Gus frequently visits to see a girl as part of an investigation into a death at the observatory.
Shawn goes into the observatory and chats with the one remaining astronomer about his late partner.
Shawn and Gus investigate the astronomer's house and discover some mysterious flowers in his vegetable garden.
Shawn and Gus head to Henry's house to ask about the plants in Hugo's garden where they discover that he has a woman over.
Source: Psych Forums