...The weapons in the fish tank. We're fairly sure Shelley was killed with the dagger. The...the wound, it could match it. The tank's missing fish, [ she wrinkles her nose but FIGHTS THROUGH IT even though Fish Are Gross ] which were used to attract the sharks. Then, the weapons -- dagger, axe, and map maker -- were tossed in. That ties the two crime scenes together.

Unless two people really are working together. But that gives double the chance someone gets caught. And if one gets caught, there's no benefit to keeping the secret for the other...right?