For two years, Catherine Marks has been a paid companion to the Hathaway sisters--a pleasant position, with one caveat. Her charges' older brother, Leo Hathaway, is thoroughly exasperating. Cat can hardly believe that their constant arguing could mask a mutual attraction. But when one quarrel ends in a sudden kiss, Cat is shocked at her powerful response--and even more so when Leo proposes a dangerous liaison.

Leo must marry and produce an heir within a year to save his family home. Catherine's respectable demeanor hides a secret that would utterly destroy her. But to Leo, Cat is...