1. READ BETWEEN THE LINES If you read between the lines, you understand what someone really means, or what is really happening in a situation, even though it is not stated openly.
*If one reads between the lines of their public statements, one is left with the impression that they're just pretending to investigate and that the decision to go ahead with mining has already been made.
*He was reluctant to go into detains, but reading between the lines it appears that the Bank of England has vetoed any idea of merger between British Banks.
2) You can also talk about the message BETWEEN THE LINES
*He didn't give a reason, but I sensed something between the lines.
*And when the trial took place, he confessed to everything and he lied against himself, but at the same time he tried to tell the truth in his own language. He tried to send a message between the lines.
(Collins Cobuild Dictionary of Idioms) :-)