After fight with Kovac, Booth tried to find out what happened right at the time of explosion.
It looks probably looks like "alien spaceship".
Homewer, it struck him that happened to them when their missing in 2007 did not remember, and as far as the remains were concerned, they mysteriously dissapered...
Only one thing what was Booth remember was a sign N7.
But he can't remembered a meaning of this sign.
"That's first when agent Booth, thinks like me," Aubrey said to himself when he passed by Booth office.
He doesn't know what happened to him in 2007.
"I have to find out what happened to me and others in 2007 Booth said to himself
"It's time to finally find out what happened," Booth said
