From flyleaf of 1970 Harcourt hardcover edition:

Went to England to live with his ony remaining relative, ten-year-old Tommy Bassumtyte found Cousin Thomas not at all what he expected, but Boxleton House, where Thomas lived, was more wonderful even than Grandpa's old tales of it. Butilt by a Bassumtyte more than four hundred years ago, the beautiful old house had changed very little since, though lately it had fallen upon hard times and sat cold and damp in its neglected gardens. It actually had a secret room, which Thomas challenged Tommy to find. Butthe room, once found, proved to be part of a still deeper riddle. Was there some truth to Grandpa's old rhyme about a Bassumtyte treasure? And Tommy unriddle it before Thomas was forced to sell his beloved Boxleton House? The answer to these questions, as they unfold, make a marvelously intriguing story that sweeps the reader on with mounting excitement to the ingenious and satisfying conclusion. ---- Jane Louise Curry has written one of her best books in The Bassumtyte Treasure, sure to please both boys and girls...and adults--those of us who love stories about a grand old ancestral home, riddles, mysteries, and the searche for hidden treasure that might keep the home from being lost to the family forever. Well-drawn and fully developed characters and completely plausible plot. A page-turner...and it even has a touch of grown-up romance. ( )