This is the 4th. book in the Galvan brides series. Annabelle, who we met in the 1st book Dante's debt has had an illness which has caused her to loose her memory. She is living 5 years in the past.
Lucio Cruz is her husband, but she doesn't remember that. They are on the verge of divorce. Dante calls Lucio to ask him to come home to Annabelle. He does.
Lucio has to help Ana to remember their past. It comes back to her in bits & pieces, but what she does remember is the son they had. Ana & Lucio were told the baby died, but Ana knows differently.
With the help of Alonso Huntsman they discover their baby, only he isn't a baby any more, he's 5.
This story really tugs at the heartstrings. A fantastic book & series.