Steven Brezenoff
7) Witch mayor
Author
Description
Hank and Gus want to investigate the legend that the Ravens Pass city hall was built over a cellar with a witch sealed inside it, and a school field trip seems like the perfect opportunity--but the witch may be waiting for them.
8) The sleeper
Author
Description
The Galactic Expansion Home for Lost Children, otherwise known in Ravens Pass as the Old Orphanage, is full of alien children ready to take over the planet--but at least one of them may actually be a human spy.