A housewife receives a one-word text from her college sweetheart: Run.
That spurs a frantic race to New York followed by a series of events near impossible to go into without spoiling things.
Run is a romantic comedy-meets-Hitchcock thriller, and not just because it takes place mostly on a train.
Merritt Wever is Ruby while Domhnall Gleason is Billy, and both are dancing around each other while harbouring much more than they are letting on.
Wever and Gleeson bring enough charm to instantly get you on their side. It's only further down the line - literally in this case - do little explosions of truth threaten to derail their adventure.
Run is produced by Vicky Jones and Phoebe Waller-Bridge, who were behind the hit comedy Fleabag, and the dialogue has the right level of spark to it.
While the flashback reveals trigger memories of Lost, the bigger question is whether weekly, half-hour episodes are enough in this age of bingeing.
The nature of reveals are tantalising, but some viewers may not have that level of patience these days.
Available on HBO Go and HBO (StarHub Ch 601/Singtel TV Ch 420), Mondays 10.30am and 11.30pm