Detectives Arthur Bryant and John May are back on the case in this whip-smart and wildly twisting mystery, in which a killer in London's parks is proving to be a most elusive quarry. Helen Forester's day starts like any other: Around seven in the morning, she takes her West Highland terrier for a walk in her street's private garden. But by 7:20 she is dead, strangled yet peacefully laid out on the path, her dog nowhere to be found. The only other...