After Catherine found out she couldn't have children she went through a major depression. Not only because she'd never get to experience carrying a little human being inside her for nine months, but because she'd never be able to give her husband (James Jacobs) the son he's always wanted. She didn't like the idea at first but soon she considered it.
The contract clearly stated that the surrogate (Mercedes Lopez) would simply carry the baby for nine months, give birth and then become a breast milk bank. No contact with the baby and no strings attached. With Catherine being over protective and paranoid she insisted that Mercedes lives with them.
But with the surrogate mother being a hot Latin woman she becomes a temptation to James.
*Note this book contains strong language, explicit and mature content. Read at own risk *wink wink smirk*.