Contemporary Romance Novel Help

Looking for a book that touches on these themes and is part of a series

- mmc is a billionaire art collector obsessed with a specific artist whose paintings are the only ones he buys

-mfc has a brother and a sister (you discover that her sister is pretending to be the artist)

-the mfc’s sister tells the mfc that she is trying to get the mmc to like her (she has been going to the same auctions he goes to)

-the mmc searches for the artist and goes to France to meet her

-The mfc knows something is wrong and calls the mmc, but he doesn’t answer

-the mmc tells the mfc that he must meet the artist

-the mfc goes to Hawaii

-the artist is in fact the mfc and the artwork is from when she was younger

-the mmc finds the mfc through her brother and tracks her down to Hawaii

-the mmc presses charges against the mfc’s sister for fraud