Let Sleeping Rogues Lie / Sabrina Jeffries 374 p.

Jeffries presents her fourth book in her School for Heiresses series.  Anthony Dalton, Viscount Norcourt, needs to prove he is an excellent guardian for his orphan niece by enrolling her in the prestigious school.  He finds himself giving instructions to the senior girls on how to identify and avoid the rakes as they go out into the marriage mart.  He is drawn to the very sensible teacher, Madeline Prescot.  Madeline has a hidden agenda for meeting with Anthony.  She wants to meet Sir Humphrey Davy, expert with nitrous oxide.  Sir Humphrey's expertise will clear her physician father's reputation.  Very hot chemistry between Madeline and Anthony makes this a very sensuous romance.