Kin Platt (1911–2003) was the author of the perennially popular I Can Read Book Big Max, as well as several outstanding young-adult novels and the Max Roper mystery series for adults. Mr. Platt was also a noted cartoonist.
Terrific followup to "Sinbad and Me". Steve and Sinbad, his bulldog, discover a witch in the local swamp, his best (human) friend acting weird, and more about himself and others around him than he realized. A bit into the supernatural, it's still a wonderful book.
This series is sadly long out of print and copies can go for $50 or more.
This is the third Sinbad book I have read. The plot was very detailed and advanced for a kids book from back in the day. Loved Steve and Minerva and Sinbad.