ISBN-13: 9781517090630 / Angielski / Miękka / 2015 / 70 str.
The Secret of Linden Hall is the first of the Timberley Three series and in this adventure the three Timberley children meet Professor Linden and his cook Hettie for the first time. There is confusion and skulduggery. A misplaced book and some steel hedgehogs. Is the Professor mad and will Billy's ingenuity and bravery save them all?