About the Book: Case Closed #1: Mystery in the Mansion
Carlos Serrano has never solved a mystery in his life. But when Carloss mom gets
sick with a nasty flu on the morning of an investigation that could save her
failing detective agency, Carlos takes on the case. With the help of his best
friend, Eliza, and her wild little brother, Frank, Carlos must uncover a mystery
involving an eccentric local millionaire, anonymous death threats, and a buried
treasure. But with tricky riddles, cagey suspects, hidden secrets, and dozens of
impossible choices, they need your help! Can you help Carlos and his friends
find the culprit and