CREATE TABLE table_1318 ("Episode" FLOAT, "Title" CLOB, "Story" CLOB, "Adapted by" CLOB, "Director" CLOB, "Airdate" CLOB, "Exists?" CLOB)

Name the msot episode that was adapted by leon griffiths
SELECT MAX("Episode") FROM table_1318 WHERE "Adapted by" = 'Leon Griffiths'
SELECT MAX("Episode") FROM "table_1318" WHERE "Adapted by" = 'Leon Griffiths'