What was the highest average point rating for a modern suspense show with 21 episodes?
CREATE TABLE table_11981 (
    "Airing date" text,
    "English title (Chinese title)" text,
    "Number of episodes" real,
    "HD format" text,
    "Highest average point ratings" real,
    "Genre" text,
    "Official website" text
)
SELECT SUM("Highest average point ratings") FROM table_11981 WHERE "Genre" = 'modern suspense' AND "Number of episodes" = '21'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What was the highest average point rating for a modern suspense show with 21 episodes? ### Input: CREATE TABLE table_11981 (
    "Airing date" text,
    "English title (Chinese title)" text,
    "Number of episodes" real,
    "HD format" text,
    "Highest average point ratings" real,
    "Genre" text,
    "Official website" text
) ### Response: SELECT SUM("Highest average point ratings") FROM table_11981 WHERE "Genre" = 'modern suspense' AND "Number of episodes" = '21'