You are South in a contract of three hearts doubled. Here is the auction and what you see when West leads the queen of clubs:
East overtakes with the club king and continues with the ace at trick two. Counting losers, you have two hearts, one diamond, and one club. The problem is you may lose trump control as defenders force you to ruff clubs. The good new is you are reasonably sure that East has the ace and queen of hearts. The bad news is that you need to get to dummy twice to finess of the ace and queen of hearts. Also, East may well have four hearts.
It looks like you will need the king of diamonds to be onside. So, you might as well make that assumption.
What card do you play at trick 3? (Remember that your are worried about losing trump control.)
I recommend discarding a diamond at trick two. That makes life difficult for East. She cannot continue clubs because dummy is now void. If she shifts to a spade you let it ride to dummy’s king. Now you can lead the 8 of hearts, expecting to to win or drive out one of East’s honors. Either way you are in control.
Similarly if she shifts to a diamond you will let that ride to dummy and play as before. You may even make an overtrick: three spades, four hearts, and three diamonds.
Here was the entire hand:
