[2][3][4] Piranha Heights serves as the third and final instalment in Ridley's unofficially titled "Brothers Trilogy", having been preceded by Mercury Fur and Leaves of Glass.

She wears a hijab with niqab, speaks in an unusual mix of English and an unknown Middle-Eastern language and also claims to have endured many horrors as a victim of an Islamic war in an unspecified country.

Also showing up at the flat unexpectedly is Alan's 15-year-old son Garth, who for years has hidden his true psychotic personality, enjoying to inflict cruelty onto others under the influence of his imaginary friend called Mr Green.

Michael Coveney of WhatsOnStage.com gave an enthusiastic review, awarding the play five stars, writing that “With this truly remarkable new play, Philip Ridley completes an East End trilogy of siblings and apocalypse – the others were Mercury Fur and Leaves of Glass – that will one day be rated one of the high water marks of British drama in the first decade of this century” adding that the production was “a work of dark fantasy and genius.”[6] Philip Fisher of British Theatre Guide gave a positive review, stating that the play “is the theatrical equivalent of a gigantic Jackson Pollock splatter painting.

Writing for the Evening Standard Fiona Mountford gave the play a 1-star review, describing it as "one of the most gratuitously unpleasant works in months, where plot, character and general point all come a distant second behind a long-past-its-sell-by-date desire to shock."