Smuggler’s den and pilot-eye. Thrills, caves and a suspicious guy…. when the spunky cousins Sam, paras, Tina and fulki arrive at panna’s 200-year-old Malabar cottage to spend their summer holidays, all they dream of is bathing in the sea, eating mangoes off trees, rowing to Malabar island and exploring caves with panna’s son vijju and his adorable dog ruffy. But fulki stares into her crystal ball and predicts strange happenings which involve a gun. Her cousins make fun of her until suddenly mysterious, suspicious things really begin to take place...Threatening notes, light signals in the middle of the night, two strange men in a Boat on Malabar island, and the theft of scientist sagar’s important documents… what exactly was happening at Malabar cottage? Did the tunnel under the sea really exist? Could the children find the truth behind the mysterious incidents? Amidst chaos, suspicion and startling discoveries, the spunky cousins solve the mystery of the Malabar cottage.