Contacts have disappeared

When I opened my Contacts this morning, it was empty, no cards, no names, nothing. They're still on my iPhone and in my iCloud account, but Contacts on my computer appears to have been completely erased. It may not have anything to do with it but I did clean out my cache on Safari yesterday. I looked in old conversations and one from December 2017 suggests going into my user library and moving my com.apple.AddressBook.plist to the desktop, but there are 2 different files that begin that way: plist.lockfile, and plist.kRBS2xP. Should I do both?

Calvin