The Swing of the Pendulum by Adriana Spadoni

At the end of the week Miss Burns left and in a few days Puck was running about the house as usual. The only reminder that something had changed somewhere in his world, were the advertisements of summer resorts that littered Margaret's desk. The doctor had ordered "bracing air, salt water and everything as unlike the city as possible. " So Gregory rented their own bungalow on Long Island to Benson for the summer and tried to be patient with Margaret in her search. She finally decided on a small boarding house in Maine, as far from civilization as she could get, where there were other children for Puck to play with. Margaret did not expect to enjoy the summer and measured her devotion to Puck by the degree of her own discomfort.

Puck was not told until it was necessary to pack Lady Jane's things. Then she was hysterical with excitement at the idea of going "a long, long way on a boat. " She invested Maine with all the magic details of Gregory's bed-time stories. But when she found that he was not coming with them, her joy died as suddenly as if it had been turned off with a spigot.