The Peppercorns and the Secret of the Deep Sea (2020)

After a break-in at the North Irish oceanographic facility where Tarun's mother Jaswinder Singh works at an invention to reduce the plastic waste mountain floating at sea, she goes missing, like key experimental results. Tarun mobilizes the four fellow peppercorns, who soon help identify the enemy: waste industry captain Robert Fleckmann, whose goons abducted the research vessel to a small harbor in Wesemünde, Mecklenburg-Vorpommern. They demand the priceless invention as ransom for Jaswinder, but Tarun realizes the heirloom pendant she confided to him recently holds the key: clues to the cave hiding place. Plans to save both those and her are crossed by a traitor.