Overview • Star Lily Case Files • Moonlit Night Castle • Detective Agency • Mystery of the Vanishing Stele • Secret Whispers of Spring Plains Secret Whispers of Spring Plains is the fifth season of the Marvel Detective Agency event. It ran from August 31st to September 13th, 2023. To read the plot for this event, see Secret Whispers of Spring Plains - Story. Help Nikki and Momo investigate the case of the missing Nirvana Clover, and gain pieces of the suit Carefree Spring Field and 100 . Use 1 F