He's not sure what changed her mind, but he believes her. There's a simple, earnest kind of promise in Abigail's tone, and Derek, perhaps unwisely, finds himself disregarding the knowledge that the Widdowsons had been considered untrustworthy.

Sliding his hands into his pockets, he comes closer to her.

"Hard to come back from a decision like that." She knows, he thinks, but the warning comes anyway.