Caroline Amphlett's true purpose in working at the nuclear plant is revealed and Dalgliesh confers with the Security Service on the next steps. It is not clear however who it is that rammed her boat. Chief Inspector Rickards is ready to close the Robarts murder case as unsolved but Dalgliesh urges him to continue and provides his own profile of the killer. Meg Dennison's alibi is weak and she clearly wasn't at home when she claimed to be. Theresa Blaney is at home recuperating and reveals to Alice Mair the identity of the person she saw at the beach the night Hilary ...