  Recently we proposed a mechanism for sequestering the Standard Model vacuum
energy that predicts that the universe will collapse. Here we present a simple
mechanism for bringing about this collapse, employing a scalar field whose
potential is linear and becomes negative, providing the negative energy density
required to end the expansion. The slope of the potential is chosen to allow
for the expansion to last until the current Hubble time, about $10^{10}$ years,
to accommodate our universe. Crucially, this choice is technically natural due
to a shift symmetry. Moreover, vacuum energy sequestering selects {\it
radiatively stable} initial conditions for the collapse, which guarantee that
immediately before the turnaround the universe is dominated by the linear
potential which drives an epoch of accelerated expansion for at least an efold.
Thus a single, technically natural choice for the slope ensures that the
collapse is imminent and is preceded by the current stage of cosmic
acceleration, giving a new answer to the 'Why Now?' problem.
