Tempers flare at Hope Zion when Dev's medical school rival arrives to start work, and Alex risks her career when she breaks the rules.
Coverage of stage four of the race from the UCI Europe Tour.
Live Cycling: Tour of Croatia
Ragnar and Floki remain at odds in Kattegat, while Rollo makes great efforts in Paris to win over his new bride. Bjorn's survival skills are put to the test in the wilderness, and Ecbert sends Aethelwulf to rescue Kwenthrith from opposing forces in Mercia.
Dwaine hits a breaking point, Willie realises he is losing money, Kristi hunts with her son and Glenn fulfils a lifelong dream.
A look at the tactics employed to pass strategically important ships under the nose of the enemy, and the use of intelligence to carry out naval attacks.