"Twelve-year-old Milo is stuck spending the winter holidays in a house full of strange guests who are not what they seem--again! He will have to work with friends old and new to uncover clues in search of a mysterious map and a famous smuggler's lost haul"--
When their detective father asks them to play burglar in order to protect a client's valuable invention from thieves, the Hardy boys find themselves involved in a large and dangerous conspiracy.