i happen to catch this on community tv a few year back and be pleasantly surprised how enjoyable a film it be . while a bit corny in certain way and a it prime function of be a mystery thriller it work superbly and thanks to a script that concoct an ingenious plot while it keep me guess throughout and the resolution be inspire . the cast be a star stud one and contain a mixture of those at the end of their career ( indeed richard long die the same year this be make ) and or those who be on the verge of stardom in hit tv series ( kate jackson and tom bosley ) . they all do a good job and with the exception of cesare danova who sleepwalk through his role . strongly recommend .