Perry Clark takes pride in her legal work for a needy nonprofit. When disaster strikes, leaving her unemployed and homeless, her sister Campbell comes to the rescue with a job offer. Perry accepts reluctantly--working for corporate clients is only temporary, right? But after Campbell assigns Grace, Perry's childhood crush, as her mentor, Perry's heart might be making longer-term plans.

Grace Maldonado remembers Perry Clark as her best friend's sometimes annoying, often rebellious, little sister, so she isn't prepared when she discovers Perry is now brilliant and gorgeous--though still bullheaded--and challenges her at every turn. When she isn't arguing with Perry, Grace is fighting a growing attraction she can't seem to ignore. Because not only is it wrong to fall in love with your best friend's sister, Perry has no intention of sticking around.