An Offering of Moonlight.

This alternate scene gives Jem’s perspective on his and Tessa’s first kiss. It begins just after “Jem said nothing all the way back from Whitechapel, merely staring stonily out the window with his arms folded while Will slept,a faint smile on his face, in the corner of the carriage. Tessa, across from them both, could think of nothing to say to break Jem’s silence. This was so utterly unlike him — Jem, who was always sweet, always kind, always optimistic. His expression now was worse than blank, his nails digging into the fabric of his jacket, his shoulders stiff and angular with rage. The moment they drew up in front of the Institute he threw the door open and leaped out…”

In Jem’s room.