There are 3 books in the The London Trilogy Series series. The newest book is His at Night which came out in 2010.

1
The Luckiest Lady in London

Book cover of The Luckiest Lady in London
From the superbly gifted Sherry Thomas comes this beautifully written romance about a marriage of convenience that turns inconveniently passionate...  

Felix Rivendale, the Marquess of Wrenworth, is The Ideal Gentleman, a man all men want to be and all women want to possess. Even Felix himself almost believes this golden…
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2
Private Arrangements

Book cover of Private Arrangements
Love has designs of its own.…

To all of London society, Lord and Lady Tremaine had the ideal arrangement: a marriage based on civility, courteousness, and freedom—by all accounts, a perfect marriage. The reason? For the last ten years, husband and wife have resided on separate continents.

But once upon…

3
His at Night

Book cover of His at Night
Love is hottest in the darkness before dawn.
 
Elissande Edgerton is a desperate woman, a virtual prisoner in the home of her tyrannical uncle. Only through marriage can she claim the freedom she craves. But how to catch the perfect man?

Lord Vere is used to baiting irresistible traps. As…