  We present a trajectory concept for a small mission to the four inner large
satellites of Saturn. Leveraging the high efficiency of electric propulsion,
the concept enables orbit insertion around each of the moons, for arbitrarily
long close observation periods. The mission starts with a EVVES interplanetary
segment, where a combination of multiple gravity assists and deep space low
thrust enables reduced relative arrival velocity at Saturn, followed by an
unpowered capture via a sequence of resonant flybys with Titan. The transfers
between moons use a low-thrust control law that connects unstable and stable
branches of the invariant manifolds of planar Lyapunov orbits from the circular
restricted three-body problem of each moon and Saturn. The exploration of the
moons relies on homoclinic and heteroclinic connections of the Lyapunov orbits
around the L$_1$ and L$_2$ equilibrium points. These science orbits can be
extended for arbitrary lengths of time with negligible propellant usage. The
strategy enables a comprehensive scientific exploration of the inner large
moons, located deep inside the gravitational well of Saturn, which is
unfeasible with conventional impulsive maneuvers due to excessive fuel
consumption.
