SOLVED. harlequin twin sister invited h discovers she has a husband and child

[crazy1bad]

Please help me to find this book. I was googling the other day and found a book where the h is invited by her identical twin sister to her mansion. When she arrived at the mansion she found out that her sister lied to her. The mansion was owned by her sister's rich husband H and they had a child. The h also discovered that the H wanted to divorce sister. Also I think the h had to pretend her twin.

I was sure that I had it on my list but couldn't find it so I desperate to add it for sure.

[crazy1bad]

Sorry, it was not harlequin. the book is Double Take