WONDERS NEVER CEASE, by Tim Downs

In Wonders Never Cease, nurse (and egotist) Kemp McAvoy believes he's found a perfect way to make a million dollars without having to work for the money. When a famous, if over-the-hill, movie star is injured in an automobile accident, Kemp is assigned to her care in ICU.
His money-making scheme involves the movie star's agent and the publisher of a runaway bestseller called Lattes with God.