The Case of Mistaken Identities / The Case of the Strange Smell Marina’s been asked by her grandfather Dr. Green, to take inventory of all the different types of wildlife in the park. She’s concerned that many of them are missing and uses POP’s clues to find them. // A strange smell is causing a stench in the Park. POP clues lead our trio to a troop of young campers who have set-up base camp in the Park and have been throwing food scraps on the ground.