The book was about a group of children staying in an old Abbot’s house or at least close to an old monastery. Virtually all I can remember of the plot was the finding of an old map in a settle in the house, which led them to find treasure in the monastery garden.I seem to remember the treasure was actually from the church and it was important for some reason that it had been found.
The book I am thinking about would have been published before 1968 I believe because i read it when I was about eight or nine in 1967. I live in England. I believe i borrowed it from the library or the school library.