Prince's College, Cambridge, is a peaceful and scholarly community, enlivened by Prudence Pinsent, the Master's daughter. Spirited, beautiful, and thoroughly unconventional, Prudence is a remarkable young woman. One fine morning she sets out for Suffolk to join her cousin Lord Wellende for a few days hunting. On the way Prudence encounters Captain Studde of the coastguard who is pursuing a quarry of his own. Studde is on the trail of a drug smuggling ring that connects Wellende Hall with the cloistered world of Cambridge. It falls to Prudence to unravel the identity of the smugglers who may be forced to kill, to protect their secret.