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We present results of a multi-year study of the high-amplitude $\delta$ Scuti(HADS) star GSC 03144-595. The star was observed between June and September in2011 and 2014 for 13 nights and 28 nights respectively. Based on our results weargue that GSC 03144-595 is a new triple-mode radially pulsating HADS, only thefifth discovered and only the second that has a fundamental frequency in thetraditional $\delta$ Scuti regime. While the frequencies and amplitudes of thefundamental and first harmonic were found to be unchanged between 2011 and2014, we found that the amplitude of the second harmonic increased by 44\%, aform of evolution not previously seen. This finding suggests that the secondharmonic may be transient, thus explaining the scarcity of triple mode HADSstars.

GSC 03144-595, a new triple-mode HADS