The term 'On the Trail of' can be summarized by two crossword solutions: 'AFTER' (5 letters) and 'Inpursuit' (9 letters). This phrase is often used to describe the act of following someone or something in order to catch up with them. It is usually used in a context of chasing AFTER a person or object, such as a criminal or a lost item. It can also be used to describe the process of researching or investigating something, such as a mystery or a historical event.