In the late '70s, I was obsessed with a five-book box set that contained The Secret of the Sachem’s Tree by F.N. Monjo and Timothy and the Two Witches by Margaret Storey. I can’t remember the names of the other books in the set (all different authors).
The one book I’m particularly interested in knowing the title and author of is about an imp that is bothering an old lady that only lives in a closed-off small section of a mansion. Any information on the three other titles in this collection!?
This looks like it may be the A Witch's Brew set, which consists of the following six books:
Found with a search for timothy "two witches" "sachem"
Based on your description of an imp bothering an old lady, I suspect you're looking for Miss Clafooty and the Demon by J. David Townsend.
Violet Clafooty was a miser! She lived in undisturbed serenity in the kitchen of a house so large no one knew how many rooms there were, and hoarded a stockingful of coins. She refused to spend a single coin, even for clothing. Miss Clafooty would walk down the street in her old-fashioned, patched, and pinned hand-me-downs and floppy picture hat. If people stared, boys hooted, and dogs snapped, she hardly noticed. Then visitors threatened Miss Clafooty's way of life; and the final visitor - the demon - was the most threatening of all.
Black and white illustrations by Edward Gorey successfully capture the spirit of this amusing tale about a miser who outwits all of her guests but one! A story boys and girls are sure to enjoy.
