Letters
Jack checks the mailbox expecting to find envelopes for the spa, but is surprised to find among them a slightly torn piece of paper with "J Harkness" on it. It's hardly a secret that he lives here, but he doesn't know the handwriting and can think of few people who would send him any kind of note. It wasn't sent through the postal service, so someone had to physically deliver it themselves.

He carries the spa mail in to give to Ianto before he turns the paper over, and then he stares at it in confusion and surprise.

First because of the Cyrillic; he hasn't read that in awhile.

"прошу прощения

Алехеи Крыцек"

Very rusty. It takes him some thinking back to the Cold War (what kind of a "war" was that, doing more fighting with alien threats than Soviets) to remember what the letters are, and that doesn't give him the first line. Does give him the last, though.

Alexei Krycek.

Huh? Jack flips the paper over as if to make sure it really said "J Harkness" and not "I Jones" on it, because it's hard to believe. Maybe it's a Russian insult— but why would he risk that when Ianto is likely to check the mail and might actually recognize it?

He thinks over the letters and tries them out loud, and when the sound of it clicks in his memory, he lets the paper slip out of his fingers, shocked.

"I'm sorry."

Krycek is sorry? Actually apologizing? Not to his face, but any kind of apology at all...

Jack numbly collects the note and finds a fresh piece of paper. He has to do this, for Ianto, and let it catch up to him later. His writing isn't as neat as usual and he's not certain if he's getting the letters right or even using the correct words.

"Я простил вас

— CJH"

Forgiving him. Jack has to.

While he doesn't know where Krycek lives, Ianto might know. And if nothing else, Krycek does come by to check on his puppies, so it could be hand-delivered if necessary.

Some relief starts to spread through him, though he's still stunned. He should show it to Ianto. Translate if necessary. Check online to confirm that he isn't mistaken about it out of hope that Krycek would actually feel some remorse.