Moeen Ali produced a remarkable all-round display to lead England to victory in the fourth Twenty20 in Barbados.
Stand-in captain Moeen struck a brutal 63 from 28 balls as England posted an imposing 193-6.
The all-rounder then took 2-28 in West Indies' reply as the hosts fell 34 runs short.
The series is perfectly poised at 2-2, with the final game to be played at the same venue on Sunday (20:00 GMT).
Having lost the toss, England started steadily on a slow pitch before Jason Roy capitalised on some loose West Indies bowling.
Roy hit three sixes in his 52, a fine effort from the opener despite looking out of sorts for much of his innings.
The bowling of Jason Holder and Kieron Pollard troubled England's batters with nagging consistency before Moeen's onslaught propelled England to their match-winning total.
There were cameos from Kyle Mayers, Nicholas Pooran and Holder in West Indies' reply but in contrast to England, none were able to post a significant score.