[lái zōng qù jì]   

来    踪    去    迹    指人的来去行踪。

踪：行踪；迹：痕迹。指人的来去行踪或事物的前因后果。

The footprints leading to a certain point and from these onwards the traces left behind

来去无踪    来因去果    来龙去脉    来情去意    来去匆匆