Lyra and Bon Bon and the Mares from S.M.I.L.E.

My Little Pony: Lyra and Bon Bon and the Mares from S.M.I.L.E. by G. M. Berrow is the seventeenth book in a series of chapter books published by Little, Brown and Company. The story involves Lyra Heartstrings joining Bon Bon's secret agency.