Adventure Stories Mischief At St Rollo's/The Children Of Kidillin 2 Books In One (HC) (P)

Adventure Stories Two books in one.
Mischief At St Rollo's - Luckily for Michael and Janet, they soon settle in their new boarding school and start to have a lovely time getting up to all sorts of mischief with their new friends. But who is the mystery boy Hugh, and why does everyone avoid him?
The Children Of Kidillin - A terrifying encounter with a strange man in a deserted hut on the gloomy Scottish hills of Kidillin hurtles Sandy, Jeannie and their two London cousins into a whirlwind race against time in the search for the answer to the man's deadly secret.