Hermelin is a special little mouse. He was born in a box of cheese and lives in an attic at 33 Offley Street. He can read books and type notes on his typewriter. Most importantly, Hermelin can solve mysteries. And the people of Offley Street are in need of a detective!
When a poet moves into the apartment above hers, young Juliana asks to meet her and together they write poems of tropical birds and a river that flows to the sea, typing out words that change the world, if only for a while.