In this book we meet Alys, a lonely and shy girl. One day she meets Mr Ffiaidd, the local tramp, and although he smells quite a bit, nobody has ever been as kind to her. In return, she decides to offer him a place to live in the shed at the bottom of her garden!

Llyfr llawn hiwmor ac antur gan David Walliams, un o awduron llyfrau plant mwyaf poblogaidd Prydain wedi'i addasu'n gampus gan Gruffudd Antur. Yn y llyfr hwn cawn glywed am hanes Alys, merch unig a dihyfer. Un diwrnod, mae'n cwrdd â Mr Ffiaidd, y tramp lleol, ac er ei fod o'n drewi braidd, fu neb erioed mor garedig wrthi.