The Garden of Roses and Cages is a Sunless Sea Story Event.
The Garden of Roses and Cages is triggered when you do the A Walk in the Rose Garden action in the Isle of Cats.
"Two Melliferous Sisters unlock the gates; your key is mostly ceremonial. Before you is a garden dipped in blood. A sea of petalled crimson. Winding paths lead to irregular rows of cages, each covered in tangles of thorn and vine. Some of the prisoners inside the cages call out to you, others mutter to themselves, or weep. A few simply stare, hopeless and silent."