(3C was a "very sound" weak jump; 3S a good raise in clubs)
[Edit: a club is led to RHO's 10, which you ruff - thanks Gerben!]
Looking at a double void, your main concern is usually to play the hand. That you have achieved, and - if the heart finesse is right - you even have a chance to make this. However, there is one minor difficulty. What is it? How do you overcome it?

Help

P 1♠ 3♣ 3♥
3♠ P 5♣ 5♦
P P 6♣ 6♦
x P P P