We show that the star KIC4840675 observed by Kepler is composed of three stars with a rapidly-rotating A-type star and two solar-type fainter companions. The A-type star is a delta Scuti variable with a dominant mode and many other modes of lower amplitude, including several low-frequency variations. The low-frequency variation with highest amplitude can be interpreted as rotational modulation with the light curve changing with time. However, the most interesting aspect of this star is a triplet of independent modes in the range 118–129 d−1 (1.4–1.5 mHz), which is far outside the range of typical delta Scuti frequencies. We discuss the possibility that these modes could be solar-like oscillations, oscillations of the roAp type or due to an unseen pulsating compact companion.