If the Viscount Falls — Sabrina Jeffries

They are the Duke's Men -- an investigative agency born out of family pride and irresistible passion....

Dominick Manton Once had his heart's desire within reach -- a bright future as a barrister and engagement to Jane Vernon, a wealthy baron's daughter. Then his brother snatched away Dom's inheritance -- and his ability to give Jane a secure future. Brokenhearted, unable to end their engagement himself without destroying Jane's reputation, Dom pretends to betray her to convince her to break their relationship off.

Now he is the Viscount Rathmoor, and when his brother's widow goes missing, a panicked Jane asks him to track down her dear friend. Dom knows his past mistakes may be unforgivable. But now, entangled together in mystery and danger... will they rekindle the passion that was never really lost?