Solve this riddle. If you succeed in winning this game, you may proceed. But BEWARE, you need to take caution, losing ends in detrimental consequences. The biggest villain in town, The Gamer, has a puzzle for you. The Gamer says, and I quote, ‘GOTCHA detective, I have kidnapped and trapped one of your meddlesome men- good riddance- but I have kindly decided to play a little game. Seven days without food makes one weak. So being the nice man that I am, I decided to feed and hydrate the peasant. I put a plethora of dishes and beverages of all kinds before him. But there is one thing/substance he should not touch. Poisoned. I know. Terrible. How dare I? An Evil Genius. I am feeling shy; stop complimenting me. Solve this riddle and tell me what the substance is and I may let your friend go. What is it? Maybe he would want to consume it for some relief because it marks the end of the quest. The problem is it also at the start of the quest. If you need a clue to figure out this riddle, the answer is in the cover and has green in the middle.’  Mysteries of every kind tend to occur when detective is on the hunt for a title and revenge. One consulting detective unrivalled in cleverness, wit and all skills on the mind, takes on villains and supervillains who leave clues behind and confuse with games, puzzles and escape rooms. Explanation of answer: T is at the beginning and end of The quesT. The cover of the book says ‘the quest master, the only letter that is green is E, which is in the middle of the word quest horizontally but also the word TEA vertically.