Cook plums over medium-low heat until fruit separates from pit. Remove all pits. Continue cooking until plums have thickened. Remove from heat and allow to cool, preferably overnight in the refrigerator.
Preheat oven to 450 degrees F. Remove fruit from refrigerator. Once cooled, mix in sugar, cornstarch, cinnamon, and cloves. Combine well.
Line pie plate with bottom crust. Pour in fruit mixture. Top with remaining crust. Seal edges of pie with your fingers or a fork. Cut several vents in the top crust.
Place pie plate on cookie sheet and slide into preheated oven. Bake at 450 for 10 minutes. Lower oven temperature to 375 and continue cooking, 50-60 minutes. Remove when crust is golden and fruit is bubbling. Allow to cool. Delicious served with a scoop of vanilla ice cream!