Case file LinkedIn Crossclimb #817: 4-letter ladder, 5 middle exhibits, combo prompt "A two-word phrase meaning "to refrigerate."". Endpoints: KEEP (top) and COLD (bottom).
Middle phase answers: "Very interested in something" = KEEN; "Someone older than twelve but younger than twenty" = TEEN; "Ready to be hit, as a golf ball" = TEED; "Open-___ shoes" = TOED; "Relayed, as a story" = TOLD.
Ordering phase: the valid middle chain is KEEN → TEEN → TEED → TOED → TOLD. This permutation is the only valid one-letter chain for these answers.
Evidence link: KEEP → KEEN. P→N at the fourth letter (KEEP → KEEN).
Evidence link: KEEN → TEEN. K→T at the first letter (KEEN → TEEN).
Evidence link: TEEN → TEED. N→D at the fourth letter (TEEN → TEED).
Evidence link: TEED → TOED. E→O at the second letter (TEED → TOED).
Evidence link: TOED → TOLD. E→L at the third letter (TOED → TOLD).
Evidence link: TOLD → COLD. T→C at the first letter (TOLD → COLD).
Verdict: KEEP → KEEN → TEEN → TEED → TOED → TOLD → COLD satisfies every one-letter constraint. The combo clue "A two-word phrase meaning "to refrigerate."" describes both end words together — "KEEP" and "COLD" each differ by one letter from their adjacent middle rungs and satisfy the shared top+bottom prompt.