The Korea Republic forward paid the pre-match price for his poor form this season when Antonio Conte benched him for his side’s final game before the international break.
But last season’s Golden Boot winner came off the bench after the break to steal the show in a superb performance that saw him score three goals in a quarter of an hour.
All three goals were scored with some degree of class, ensuring Spurs will enter the international arena on a winning note and leave Leicester boss Brendan Rodgers under mounting pressure.
The Foxes started brightly when Youri Tielemans put them ahead from the penalty spot after just six minutes, but Harry Kane added another goal to his tally when he equalized for Spurs two minutes later.
Eric Dier put the home side ahead in the 21st minute, but James Maddison leveled for Leicester to keep them level at the break.
Rodrigo Betancourt restored Spurs’ lead soon after the restart before Son’s antics followed with goals in the 73rd, 84th and 85th minutes.