Book 4: Dog Bless You
Autumn has come to Bucks County, and Steve Levitan has a new job: develop a conference center for Eastern College at Friar Lake. But on his first visit to the property, his golden retriever Rochester makes a disturbing discovery, a human hand rising from the dirt at the lake's shore.
Book 5: Whom Dog Hath Joined
When Steve Levitan's golden retriever Rochester digs up a human bone at the Quaker Meeting House, the two intrepid sleuths are at it again, sniffing out a mystery with its roots in the Friends' efforts to help Vietnam war resisters.
Book 6: Dog Have Mercy
It's Christmas and Steve Levitan and his golden retriever Rochester need to help clear the name of an ex-con working at their vet's office. Don't worry— Rochester is never going to come to harm, though he and Steve certainly get into trouble!