It's a cute story. Old high-school colleagues meet up in totally different circumstances years afterward. Instant chemistry from both sides yet one lets logic (his term of logic, that is) and ambitions get in the way and decides to date the other's sister instead. It would've brought a lot of misery and drama, but (thank god) after one designed date with said sister Jack, the daft bugger, realizes his mistakes. Not that he's spared the anxiety when things don't turn out as he expected (serves him right). At least for a bit.
Jack may sound like a jerk with how he treated Noah. And Noah appears like such a pushover at times. But I like that the author didn't make the case so for long. A good easy reading.