英语翻译不知怎么翻啊.真的是lies。看完就明白了。

should be:
He read between the LINES

After viewing the movie poster, my interpretation would be:
the ability to read between the lies.
That means to find the truth in between the collection of lies.
It could also be to find more lies in the middle of existing lies.
Of course, you will have to watch the movie to understand what is in the plot. 当然是你看完了影片之后,就明白了!而不是我们!

read between the lines 不是 lies
是一种谚语 ：是字里行间的隐喻, 含蓄的表达，言外之音的意思
请你把整句写下来，是不是医学报告 ？

read between the lines
固定用法
他看出字里行间的意思,体会言外之意;
明白其言外之意