#PuffinBooks

Ivy and Maggie have been best friends ever since they were born at exactly the same minute on Friday 13th - twelve years ago. They're always on the lookout for their next adventure, and, when strange and mysterious things start to happen in Crowood Peak, it's up to them to work out what's going on.

All the evidence points to the old house next door with purple smoke coming out of the chimney, and a new owner who looks suspiciously like a witch!

Can Ivy and Maggie solve the mystery of Hokum House, or will this adventure spell more mischief than even the Double Trouble Society can manage?