Tragedy strikes Bill Shadwell when his herd of dairy shorthorns contracts Johne's disease. As Shadwell approaches retirement, his son is keen to move into more profitable Friesian dairy cattle -- a move which means both James and Siegfried are caught up in the family's battle of wills. Mr. Grimsdale's bull poses problems of a different kind when Siegfried is convinced it has swallowed a dangerous metal object. But tightfisted Grimsdale is not convinced that an operation is needed. Tristan's new metal detector could prove to be the solution to a tricky dilemma.