The Halloweeds

When Dan's parents don't make it back from a trip to the jungle, he, his sister Martha and baby Grub are packed off to crumbling Daundelyon Hall, where Great-Aunt Grusilla cares only about tending to her mysterious graveyard garden.
But why are Grusilla and her curious servants each missing a finger? Has this something to do with the greedy 'Cabbages' in the greenhouse? And can Dan solve the mystery, keep his family together and hold onto all his fingers?