Tansy pretended to have a girlfriend to avoid family bs, especially events that involved her one-time lover Tucker, who is connected to her family I forget how. He's a bad dude, but he belongs to a prestigious (wealthy) clan, the van Dalens, and Tansy's stepmother is a climber. The fake girlfriend is a romance book cover model who shows up to Tucker's wedding and upon learning of Tansy's fake relationship with her makes it real and ups the deal by inventing their engagement.

The rest of the novel is a girl gets girl, girl loses girl, and girl gets girl back (spoiler! but it's a romance novel so sorry/not sorry). It's a cute romp with likable characters and a surprise villain.