only to find表示“结果发现”,相当于and found.
动词不定式表示结果,通常不是人们所期望的结果,往往是不好的结果,前面常常加上only.主句谓语与不定式本身没有因果关系,只是先后发生的两个动词,所以可改为and...又如：
He hurried to the station,only to find the train had left.
He hurried home,only to find his mother was gone.