ISBN-13: 9781849904193 / Angielski / Miękka / 2014 / 368 str.
Adjacent to our universe, but separated from it by a barely comprehended gulf of higher dimensions, lies another slice of reality, with its own galaxies, stars and worlds. The two have been separate since the dawn of time, never touching, never meeting. Until the Sild broke through into our universe. Now they wait, sleeping in stasis on board their war fleet, but ready to continue with their invasion. UNIT is brought in to investigate a series of shipping losses and attacks on drilling platforms. The Doctor believes that it is the work of a previously unknown marine intelligence.