Mistletoe in Paradise by Jill Shalvis

Problem Number One – Getting There
Old childhood friends each fly separately to join their families on what’s been an annual holiday themed yacht adventure. Secret ex-lovers, Hannah and James are determined to make the best of things…

Problem Number Two – Getting Stuck.
When everyone but Hannah and James gets held up in an airport snarl, it leaves them stuck together for four days, making Hannah’s already problematic trip a whole lot harder to face. Especially because she comes bearing more than just gifts…

Problem Number Three — Falling In Love (again)
As the former lovers try to make the best of the Christmas snafu, they soon realize that the best things in life can’t be planned and sometimes love is sweeter the second time around.