What is the westing game about?

Mr. westing is 4 people: Eastman, Northrup, Westing, and McSouthers

Crow & Otis get married

Turtle and Theo get married

Turtle wins the game

Doug wins an Olympic gold medal

but in his will he said that the four winds had killed him and he was the four wind if you notice in each name there is the Word north or east or south or west and turtle found out when she was 10 years older!

but in the clues the missing letters spelled bertha erica crow and therefor they all think she done it because she addmitited to it