The Wife Trap by Tracy Anne Warren

Your presence is requested at a wedding deception. 

After orchestrating a scandalous high-society ruse, Lady Jeannette Brantford is banished from her family's estate in England and sent to live with boring elderly cousins in the Irish countryside. But Jeannette's exile is surprisingly eventful. En route to her dreaded destination, she encounters Darragh O'Brien, a devilishly handsome architect who transforms Jeannette's punishment into a delicious whirlwind of wits, words, and undeniable passion.

Although no less than a duke could satisfy a lady of her status, Jeannette is unable to extinguish the burning desire she has for Darragh's smoldering looks and sizzling kisses. Little does she know, her dashing Irishman is no commoner. He's the eleventh Earl of Mulholland and he's thoroughly enjoying the irresistible game of hard-to-get. But before he reveals his true identity, a little temptation and trickery are in order to teach his fair lady a lesson or two about love.