Land at Argyle Airport (SVD), step onto a private boat, and be on Mustique in about 40 min. No ferry timetable, no overnight on the wrong island — the transfer is timed on your flight.
The public ferry runs on its own timetable and rarely matches an arriving flight; a missed connection means a night on Saint Vincent instead of Mustique.
A private transfer leaves when you land, takes your luggage in one go, and covers the 31 km in about 40 min.