Mike's pent-up unhappiness disappeared immediately after hearing her words.

What she said was true.

Elliot had an irritable temper, and he would almost certainly lose his mind if he knew that Shea was still alive. He would even go so far as to kidnap Adrian and tie him down to the operating table just so Shea could get the kidney transplant.

On the off chance that the operation failed and he saw Shea dying before his own eyes, how was he even supposed to face that immense blow?

"There's only