Paperwork before mourning
The twins need Sam’s thumbprint to claim their promised money.
Supporting source ↗CASE FILE · S18 E02

The Reynolds twins push themselves to the limit to secure Sam's transfer of wealth. Charlie and Frank plan a proper memorial for Bonnie during the annual Mummers Parade.
THE SHORT VERSION · SPOILERS AHEAD
The twins need Sam’s thumbprint to claim their promised money.
Supporting source ↗They remove a stranger’s thumb before learning Frank has collected Sam.
Supporting source ↗Luther anticipates Mac’s warning and leaves Donald facing the police.
Supporting source ↗Frank fires Sam’s body and Bonnie’s ashes from a cannon, ending the twins’ plan.
Supporting source ↗THE EVIDENCE
Charlie wears memorial portraits on his elaborate parade costume.Source ↗
Dee searches the parade crowd beside Dennis.Source ↗
Dennis holds the certificate obtained from the mortician.Source ↗
Donald hosts his family before the deception.Source ↗
Frank stands beside the brightly painted cannon.Source ↗
Luther receives Mac’s visit while still in prison.Source ↗
The mortician talks to the twins beside Sam’s remains.Source ↗
Jack examines the paperwork with a magnifying glass.Source ↗
Donald hosts his family at home.Source ↗
Charlie’s house sale would finance the funeral.Source ↗
The twins visit the mortician’s examination room.Source ↗
The brightly decorated cannon becomes Frank’s farewell device.Source ↗
The twins obtain Sam’s death certificate.Source ↗
Jack enlarges a fingerprint with the handheld lens.Source ↗
Jack compares the fingerprints on the documents.Source ↗
Marriage paperwork blocks the twins’ inheritance.Source ↗
Charlie joins the two Mummers farewells.Source ↗
Tags document researched occurrences, not every appearance. Read the research notes and attribution.