Cambridge, 1940. Snow is falling thick and fast on a cold winter's
night. As a college porter makes his nightly rounds, he is startled to
hear a boy's desperate screams for help coming from the icy river below.
But by dawn the river has claimed its victim.
When the following night an Irish Republican slogan is left at the scene
of a factory explosion, Detective Inspector Eden Brooke questions
whether there could be a connection between the two events. As more
riddles come to light, he begins to close in on a killer, but there is
one last twist: it seems that the boy had his own startling secret.