Echoes below

The truth didn't stay buried with the U-boat.Months after the events of Secrets of the Deep, diver Markos Leonidis is still haunted by the wreck that changed everything — when a series of unexplained tremors draws him back into the Mediterranean.Aboard the research vessel Aletheia, Markos is joined by Noah Regev, Dr. Eleanor Whitman, and Jem Taner — his trusted diving partner whose hidden ties to ...