The Girl's Guide to Summer (I See London, I See France #1)
Sarah Mlynowski

BUT... The trip gets off to a bad start when Leela's ex-boyfriend shows up on their flight out of JFK. When they touch down in London, Leela Instagrams their every move in the hope Matt will come and find them... Which he does, along with the most gorgeous guy Sydney has ever seen.
Will Sydney's summer fling last the distance? And what will happen when they all head home?