Storm by Boris Starling

Detective Kate Beauchamp is saved from a sinking ferry along with many other frightened passengers. Jumping into work, a horrific murder of a young woman, Kate tries to stuff her fears and disturbing memories by working long hours and entrusting her young son to the care of her aunt. The second murder finds her contacting a former agent, now imprisoned, for help in identifying possible suspects. One by one the suspects are detained and questioned. Who is this deranged sadistic murderer. Is it someone she knows? Is it a "friend"? Starling writes as twisted a tale as his first, Messiah. A good read. Sandy Penton