The four start out on their trips to the river and the island. Z continues to stall with production of Mr. Trepid's map, feeling more protective of the kids since he believes that Dallas and Florida may really be his biological children: he sees their birth certificate and it looks as if their mother was Z's runaway wife. Eventually he gives Mr. Trepid a map that shows possible hiding places, but Z has removed the understone funds to protect them from Mr. Trepid. On Tiller and Florida's small trip while rafting down a river, their boat capsizes and Tiller suffers a heart attack. Luckily, Dallas, Sairy, and Z find them in time and Tiller is taken to a hospital where he recovers. Z bonds with the twins and they set up traps for Mr. Trepid who looks for the understone funds but fails to find them.